Flourless Sponge Cake
Tips: To make vanilla sugar, split 1 vanilla bean lengthwise with the tip of a sharp knife. Cut into 2-inch pieces and grind in a blender with 1 cup sugar. Pass sugar through a fine sieve. (The sugar will keep indefinitely in a tightly covered container at room temperature.)
To warm egg whites to room temperature, place them in a bowl over hot water. Whisk for a few minutes until they feel slightly warm to the touch.
Dried egg whites, such as Just Whites, reconstituted, can be substituted for fresh egg whites.
1/2 starch, 1 other carbohydrate