10-inch genoise cake

MAKES 3 LAYERS

  1. Preheat the oven to 350 degrees F. Line the bottoms of three 10-inch round cake pans with rounds of parchment or waxed paper but do not grease them.
  2. Lightly beat the eggs in a large heatproof bowl. Gradually whisk in the sugar and set the bowl over a larger pot of barely simmering water. Whisk constantly until the egg mixture darkens slightly and is warm to the touch, 100 degrees F on an instant-read thermometer.
  3. Remove from the heat and whisk in the vanilla. With an electric mixer, beat on medium-high speed until a slowly dissolving ribbon forms when the beaters are lifted, about 6 minutes.
  4. Sift about a third of the flour over the top of the batter. Quickly and gently fold it in. Repeat 2 more times with the remaining flour, folding just until no white streaks remain. There will be 15 cups of batter; gently pour 5 cups into each of the 3 prepared pans.
  5. Bake the cakes for 21 minutes, or until a cake tester or wooden toothpick inserted in the center comes out clean. Transfer to wire racks and let the layers cool completely in their pans. To unmold, run a blunt knife around the edge to release the cakes. Carefully peel off the paper liners.