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An upside-down cake is a cake that is baked in a single pan, then turned over and served upside-down.
Usually chopped fruits—such as apples, pineapples or cherries—and a butter and sugar topping are placed on the bottom of the pan before the batter is poured in, so that they form a decorative topping once the cake is inverted.
Traditional upside-down preparations include the American pineapple upside-down cake, French Tarte Tatin, and Brazilian Bolo de banana. It is also well-known in Hawaiian culture too.