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What does "Aszu" mean ?
The term "Aszu" literally means "dried berries". Under the hot autumn sun, the raisins virtually "bake" (become shrivelled) and the "botrytis cinerea" (noble rot) begins its process of sugar concentration and the reduction of the berry's natural level of acidity. These berries, having lost their water content, are thus called "aszu", meaning "dried".