Coconut Cloud Cake Ingredients FOR THE CAKE 1 cup sifted cake flour 1 1/2 cups superfine sugar 14 large egg whites (1 3/4 cups), room temperature 1 tablespoon warm water 1/2 teaspoon salt 1 1/2 teaspoons cream of tartar 2 teaspoons vanilla extract FOR THE SEVEN-MINUTE FROSTING 3 large egg whites 1 1/4 cups