Good-Cooking - Sponge Cake

Ingredients

• 1 cup cake flour
• 1 cup sifted granulated sugar, divided
• 1 1/2 teaspoons grated lemon rind
• 2 tablespoons water
• 5 egg yolks
• 1 1/2 tablespoons lemon juice
• 5 egg whites
• 1/4 teaspoon salt
• 1/2 teaspoon cream of tartar