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- There's no need to sift the flour before measuring it, but stir the flour to lighten it before spooning it gently into a dry measuring cup.
- Egg yolks should be beaten with an electric mixer on high speed until thick and a pale lemon color.
- It is important to roll the cake when it is still warm. Start at a short side and loosely roll up the cake and towel together. The towel keeps the cake from sticking to itself as it cools. The powdered sugar sprinkled on the towel prevents the towel from sticking to the cake.
- When the cake has cooled on a wire rack, gently unroll it. Spread cake with desired filling. Roll it up again without the towel.