Sponge cakes contain plenty of eggs, but little or no butter (although chiffon cakes do contain a generous amount of oil). All of these cakes require hand folding: Dry ingredients (and sometimes butter) are folded into whipped whole eggs, or else whipped egg whites are folded into the rest of the batter.
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Sponge cakes contain plenty of eggs, but little or no butter (although chiffon cakes do contain a generous amount of oil). All of these cakes require hand folding: Dry ingredients (and sometimes butter) are folded into whipped whole eggs, or else whipped egg whites are folded into the rest of the batter.