Koji is a type of fungus (Aspergillus oryzae) used in eastern Asia for fermenting foods. It’s the primary ingredient behind many popular Japanese items like soy sauce, miso, and sake.

Is Koji vegetarian or vegan?

Yes, Koji is plant-based and suitable for both vegetarian and vegan diets.

What does Koji taste like?

It brings a sweet, rich, and umami flavor that enhances the original taste of foods.

Yes, Koji itself is gluten-free, but always confirm as it can be used in products that do contain gluten.

Can Koji be used in bread baking?

Yes, Koji can be used to naturally leaven bread, contributing to its texture, flavor, and shelf life.

How is it traditionally made?

Koji is traditionally made by inoculating steamed grains, usually rice, with the Aspergillus oryzae spores.

Is it safe to eat Koji?

Yes, Koji is safe to eat. It has been used for centuries in Asian cuisines.

How can you store Koji?

It can be stored in a cool, dark place like a pantry or the refrigerator, making sure it’s well sealed to avoid moisture.

Can I make Koji at home?

Yes, with the right environment and materials, you can make Koji at home.

What are some common dishes that use Koji?

It is used in making miso, Sake, rice vinegar, soy sauce and to ferment meats, fish and vegetables.

Are there health benefits associated with Koji?

Koji aids in digestion, provides a good source of protein, and is rich in vitamins and minerals

Is Koji the same as mold?

Koji is a type of beneficial fungus or mold, but not all molds are Koji.

What does Koji do to food?

Koji breaks down the proteins, carbohydrates and fats in food, enhancing the taste and making them easier to digest.

What is the relationship between Koji and Umami?

Koji helps produce a rich umami flavor in foods through the process of fermentation.

Is there a western equivalent to Koji?

Although there isn't a direct western equivalent, the concept of using yeast and bacteria in bread-making and cheese-making is similar.

Where can I buy Koji?

You can buy it at Weee! Asian Market, www.sayweee.com.

FAQ

Are there Asian supermarkets in U.S.?

Yes! At SayWeee you'll find your Asian grocery items in our Chinese, Vietnamese, Japanese, Korean, Indian and Thai stores. Get your favorite Asian products delivered to U.S. without leaving home.

What is the minimum order for free shipping?

Free shipping threshold varies by regions.

Do you have a physical store location?

We are an exclusively online retailer and do not currently have any physical store locations. This helps us keep our prices low.

What are your standard shipping costs and delivery times?

We have free delivery minimum on order over $35. Order minimum varies by regions.

What areas do you deliver to?

We deliver across the entire state. We deliver to all 50 US states.

Where to buy koji near me?

Asian American store with
free delivery available*

*Orders above $35, varies by region

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Top 5 products for Koji

#1

Hikari Shio Koji (Japanese All Purpose Seasoning) 20.4 oz

A versatile addition to your pantry, Hikari Shio Koji is an all-purpose seasoning, making it the perfect match for a query on Koji. It's a critical ingredient in numerous Asian dishes, imparting a sweet, savory umami flavor to marinades and sauces. This Koji seasoning enhances the taste of sushi, sashimi, grilled fish, and pickles. As a natural tenderizer, Hikari Shio Koji also healthily replaces salt, maintaining the nutrients and improving digestion. This is your key to authentic Japanese cuisine.

$8.99 - $10.99

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Whatever you soak and cook with it will turn out delicious. It tastes even better than if you just use the liquid because the koji remains.
Sakurasaku
It's really delicious if you season the cabbage with shio koji, add pepper, and sesame oil, and mix it up!
Dhtmdnjfxm
This is my first purchase. I'm happy that the bottle is larger than I expected. I'd like to use it in a variety of dishes.
chidrelghnimi
Just sprinkle it on your ingredients and let them soak to enhance their flavor! I use it frequently because it seems that soaking meat or fish in shio koji breaks down the protein into amino acids, enhancing the flavor and leaving them tender and moist.
Lake Las Vegas
I always keep it stocked in the fridge.
HolyCow
It tastes great for marinating meat and stir-frying. I bought a second bottle.
weee.7562231
I make this with KARAAGE (Japanese style fried Chicken). It’s super delicious. I will definitely order this again!
chikaazumaya
The one in my fridge was out of date, so I bought it again. I'll definitely use it this time.
rubyandcoco
I love using this to tenderize & flavor meat before cooking. Just marinate while getting your other ingredients ready. Also lessens the meaty smell, if any. This is a great product & I have been using it for years. Now I can conveniently buy from Weee! instead of making a trip to my local Japanese market.
Yuko

#2

Cold Mountain Rice Koji 20 oz

Rich rice koji offers natural enzymes and probiotics that boost umami, sweetness and digestibility. Ideal for miso, sake, amazake, pickles, salad dressings or marinades, delivering a deep, nutty flavor while supporting gut health.

$9.89 - $10.99

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I didn't have any shio koji so I decided to try making it myself. I'm looking forward to trying various variations!
Roomy
Just starting the fermentation process! Can’t wait!! I’ve been looking for this for awhile
Logan
This is my first purchase. I'm really looking forward to using it for anything.
Lacelace358
I always buy this. I often make shio koji, but this also makes a delicious amazake.
MomoHana
I have purchased it many times. I no longer need to buy it from Nikkei Supermarket!
Miya8989
Asian yeast, excited to use in varied dishes
weee.14733075
It’s dry koji!
Kan∞
This is my first time buying rice koji. I want to try making sugar-free red bean paste and salt koji. If it works and tastes good, I will put it on my regular list.
Alisia

#3

Iseso Miyako Koji 500 g

Premium Koji delivers rich umami and natural sweetness, ideal for homemade miso, soy sauce, sake, and marinades. Boosts probiotic content, supports digestion, and adds depth to ramen, pickles, and grilled fish. Perfect for Japanese chefs seeking authentic flavor. Boosts soups, sauces, desserts too.!

$9.89 - $11.79

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This is my first purchase, and I'm happy that I was able to buy it cheaper than elsewhere!
weee.16627216
Prepare the chickpea miso.
yukaboo
The only thing the supermarket sells is red miso, which I don't like, and it's expensive! (A small pack costs $15.) I bought koji and made white miso. I like my white miso sweeter, so I added a little more. Making it myself is cheap, you can make a lot, and best of all, it's delicious! I'm proud of myself!
yokoflores721
This is amazing to improve flavor to meat and vegetables even soup stock. So happy I can’t wait to make a batch.
weee.10353885
I bought this because it was larger than the koji sold at my local Japanese supermarket. I'm thinking about making miso for the first time in a while!
ugetsu26
I’m glad I found this I make “shio koji” with this
Ku_127
I'm really looking forward to making shio koji, soy sauce koji, and dashi koji with Japanese rice koji. I made amazake with the stuff I bought last time, and it was delicious!
IzumiD
I'm looking forward to making koji water, amazake, dashi koji, and onion koji.
IzumiD

#4

IseSo Miyako Handmade Rice Koji 1kg 1 count

Premium rice koji provides natural enzymes for fermentation, delivering deep umami and sweet‑sour notes. Ideal for miso, shio koji, sake, pickles, and marinades in Japanese and Korean dishes. Boosts digestion and nutrition, making it a versatile pantry staple. Great for home cooks seeking deep umami.

$19.49

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I made soy sauce koji I made it once and it was delicious, so I made it a second time~
kaorumase
I am excited to make Amazake (Rice Koji Drink) with it. There are many recipes that I can try with Koji...making miso, pickles..etc.
Kumiko
I am very happy to be able to buy the rice koji that I have missed for a long time on weee.
iw
I made miso this month too I'm grateful that the recipe for miso is displayed I bought two bags, so I'm thinking of making shio koji or soy sauce koji too.
kaorumase
I always use this koji to make homemade miso and other koji seasonings. Even though it is dried koji, it is very soft and easy to use!
gmidori214
I always bought it from a certain major website, but I'm happy to be able to buy it cheaply here! At home, we make our own salt koji, soy sauce koji, miso, etc., and Miyako Koji is an essential item, so it's very helpful
aonigirii
I prepared Shio Koji!
May

#5

Marukome Hana Koji Miso 650 g

This koji is a crucial ingredient in Asian dishes like miso soup, marinades, and pickled vegetables. Marukome Hana Koji Miso boasts a robust, savory flavor, enhancing the depth of your meals. Koji holds health benefits, including aiding digestion and boosting immunity. Its 650g size offers great value, ensuring you have enough for various delectable recipes.

$5.79 - $8.79

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It has a gentle taste and I keep buying it!
weee_1356712
It is a slightly sweet miso. It does not contain dashi, so it can be used in a wide range of dishes.
azusa18
It was out of stock, but it's finally back in stock. It's smooth and delicious. I'm glad it's now cheaper.
Arlington
This miso is the best. It's fragrant, rich, and savory.
Sandra Chen
Little liquid from the paste after opening, but it’s just as good as it supposed to taste
TJtwins
It's so delicious that I bought it again
weee.12796647
It's a bit too sweet. I'll buy something different next time.
weee.15825129
It's very salty, so don't add too much. The taste is just average.
日出江花红胜火
This is my favorite flavor out of all the varieties available.
mishaabby0

Popular recipes

Instant Pot Koji Chicken

Deliciously tender, this recipe uses to bring out the subtle flavors of chicken in the Instant Pot. Packed with protein, it's a healthy and satisfying main dish. You will need chicken thighs, , soy sauce, garlic and scallions.

Koji Stir-Fry Vegetables

A quick, easy and delicious recipe to level up your stir-fry. Using in this recipe creates a unique deep flavor in your favorite vegetables. The essentials for this recipe are mixed vegetables, , sesame oil, garlic and soy sauce.

Koji Miso Soup

A twist on a classic, this Koji Miso Soup is simple, hearty and full of good-for-you ingredients. Adding to the traditional recipe brings the dish to a whole new level. This recipe requires water, , miso paste, tofu and green onions.

Rice Cooker Koji Rice

Let the rice cooker do all the work in this simple, satisfying dish that showcases the unique flavor of . Trust us, it takes plain rice to a whole new level. All you need is rice, , water, salt and sesame oil.

Koji Marinated Tofu

A simple, but flavor packed dish where tofu gets a big upgrade from . Super easy to prepare and results in a delicious and complex-flavored tofu. You'll need tofu, , soy sauce, garlic and green onions.

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Frequently asked questions

What is Koji?
Koji is a type of fungus (Aspergillus oryzae) used in eastern Asia for fermenting foods. It’s the primary ingredient behind many popular Japanese items like soy sauce, miso, and sake.
What does Koji taste like?
It brings a sweet, rich, and umami flavor that enhances the original taste of foods.
Can Koji be used in bread baking?
Yes, Koji can be used to naturally leaven bread, contributing to its texture, flavor, and shelf life.
Is it safe to eat Koji?
Yes, Koji is safe to eat. It has been used for centuries in Asian cuisines.
Can I make Koji at home?
Yes, with the right environment and materials, you can make Koji at home.
Are there health benefits associated with Koji?
Koji aids in digestion, provides a good source of protein, and is rich in vitamins and minerals
What does Koji do to food?
Koji breaks down the proteins, carbohydrates and fats in food, enhancing the taste and making them easier to digest.
Is there a western equivalent to Koji?
Although there isn't a direct western equivalent, the concept of using yeast and bacteria in bread-making and cheese-making is similar.

Is Koji vegetarian or vegan?
Yes, Koji is plant-based and suitable for both vegetarian and vegan diets.
Is Koji gluten-free?
Yes, Koji itself is gluten-free, but always confirm as it can be used in products that do contain gluten.
How is it traditionally made?
Koji is traditionally made by inoculating steamed grains, usually rice, with the Aspergillus oryzae spores.
How can you store Koji?
It can be stored in a cool, dark place like a pantry or the refrigerator, making sure it’s well sealed to avoid moisture.
What are some common dishes that use Koji?
It is used in making miso, Sake, rice vinegar, soy sauce and to ferment meats, fish and vegetables.
Is Koji the same as mold?
Koji is a type of beneficial fungus or mold, but not all molds are Koji.
What is the relationship between Koji and Umami?
Koji helps produce a rich umami flavor in foods through the process of fermentation.
Where can I buy Koji?
You can buy it at Weee! Asian Market, www.sayweee.com.

Whatever you soak and cook with it will turn out delicious. It tastes even better than if you just use the liquid because the koji remains.
Sakurasaku
It's really delicious if you season the cabbage with shio koji, add pepper, and sesame oil, and mix it up!
Dhtmdnjfxm
This is my first purchase. I'm happy that the bottle is larger than I expected. I'd like to use it in a variety of dishes.
chidrelghnimi
Just sprinkle it on your ingredients and let them soak to enhance their flavor! I use it frequently because it seems that soaking meat or fish in shio koji breaks down the protein into amino acids, enhancing the flavor and leaving them tender and moist.
Lake Las Vegas
I always keep it stocked in the fridge.
HolyCow
It tastes great for marinating meat and stir-frying. I bought a second bottle.
weee.7562231
I make this with KARAAGE (Japanese style fried Chicken). It’s super delicious. I will definitely order this again!
chikaazumaya
The one in my fridge was out of date, so I bought it again. I'll definitely use it this time.
rubyandcoco
I love using this to tenderize & flavor meat before cooking. Just marinate while getting your other ingredients ready. Also lessens the meaty smell, if any. This is a great product & I have been using it for years. Now I can conveniently buy from Weee! instead of making a trip to my local Japanese market.
Yuko
I didn't have any shio koji so I decided to try making it myself. I'm looking forward to trying various variations!
Roomy
This is my first purchase, and I'm happy that I was able to buy it cheaper than elsewhere!
weee.16627216
Prepare the chickpea miso.
yukaboo
The only thing the supermarket sells is red miso, which I don't like, and it's expensive! (A small pack costs $15.) I bought koji and made white miso. I like my white miso sweeter, so I added a little more. Making it myself is cheap, you can make a lot, and best of all, it's delicious! I'm proud of myself!
yokoflores721
This is amazing to improve flavor to meat and vegetables even soup stock. So happy I can’t wait to make a batch.
weee.10353885
I bought this because it was larger than the koji sold at my local Japanese supermarket. I'm thinking about making miso for the first time in a while!
ugetsu26
I’m glad I found this I make “shio koji” with this
Ku_127
I'm really looking forward to making shio koji, soy sauce koji, and dashi koji with Japanese rice koji. I made amazake with the stuff I bought last time, and it was delicious!
IzumiD
I'm looking forward to making koji water, amazake, dashi koji, and onion koji.
IzumiD
I made soy sauce koji I made it once and it was delicious, so I made it a second time~
kaorumase
I am excited to make Amazake (Rice Koji Drink) with it. There are many recipes that I can try with Koji...making miso, pickles..etc.
Kumiko
It has a gentle taste and I keep buying it!
weee_1356712
It is a slightly sweet miso. It does not contain dashi, so it can be used in a wide range of dishes.
azusa18
It was out of stock, but it's finally back in stock. It's smooth and delicious. I'm glad it's now cheaper.
Arlington
This miso is the best. It's fragrant, rich, and savory.
Sandra Chen
Little liquid from the paste after opening, but it’s just as good as it supposed to taste
TJtwins
It's so delicious that I bought it again
weee.12796647
It's a bit too sweet. I'll buy something different next time.
weee.15825129
It's very salty, so don't add too much. The taste is just average.
日出江花红胜火
This is my favorite flavor out of all the varieties available.
mishaabby0
My usual miso was sold out, so I bought this for the first time. I feel safe knowing that the ingredients are domestically produced.
Lemon Lime
very delicious. Smooth and easy to drink.
Co0823bae
I repeat it every time
weee.16721573
It's delicious. Maybe it's because the beans aren't whole, but they're well-mixed and the threads(?) look better, but it's even more delicious. This is also a product I'll buy again.
weee.13728386
I got it cheap on sale!
tainachuck0
my go-to natto from weee. always good quality.
weee.13607324
I used to be one of those people who couldn't eat natto, but thanks to this one, I got into it because it's not greasy and has a subtle flavor.
SERINA
I was able to purchase it cheaper than usual!
Legoooo!
Want to return this item Disappointed!
Lisboa
Kids love it too. It's also delicious as a starter for making natto.
saccho
Speaking of natto, this is it!
sakiyajin
Very well packaged
hnthang9396
I love this miso paste, which I use to make miso soup. I also use it to marinate fish before grilling.
AileneEvans
I drink it when I get hungry in the middle of the night or mix it into my oatmeal and eat it!
ImeSP
It was just as delicious as regular miso. It contains dashi, so it's easy to use and very helpful.
Dhhdhfjdxo
Very delicate, very convenient to put tofu in soup.
琳
I had miso soup and it was delicious.
greatjenny.jung
I was able to buy it cheaply. The quantity is large, so it's useful since I make miso soup almost every day.
hhh
Can’t wait to try this thank you Weee!
Olivia
You can use it just like in Japan.
nana
Pretty decent sized box and about 15 percent cheaper than my local area supermarket
jgui