Savor a rich yet delicate treat with this roll cake made from prized Annou sweet potatoes. Grown on Tanegashima Island in Kagoshima Prefecture, Annou sweet potatoes, or imo, are celebrated in Japan for their naturally high sugar content and smooth, custard-like texture when cooked.
Here, their sweet, earthy flavor profile is transformed into a fragrant, velvety cream and wrapped in a soft, moist sponge cake. The subtle sweetness of the potato complements the lightness of the cake, resulting in a perfectly balanced bite. Ideal with tea or coffee, this roll cake highlights the elegance of regional ingredients in a classic Japanese confection.