Hiyayakko (冷奴) is a tofu block served cold. The toppings put on the tofu vary between households and restaurants, but a standard combination is sliced leeks with katsuobushi (dried bonito flakes) and soy sauce. Hiyayakko can be served with ordinary meals or with beer. It is most popular during the summer season. There are two kinds of tofu used in hiyayakko: the most commonly used kind is the kinugoshi type, and the less commonly used kind is momen .

Hiyayakko is the summer version of the hot-water yudofu (湯豆腐).