yokan

n. popular Japanese thick jello made of sweet azuki beans

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is a thick jellied dessert made of red bean paste, agar, and sugar. It is usually sold in a block form, and eaten in slices. There are two main types: neri yōkan and mizu yōkan. "Mizu" means "water", and indicates that it is made with more water than usual. Mizu yōkan is often chilled and eaten in summer.
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