Sponge Cake for Brazo de Gitano (Gypsy's Arm Roll)

Ingredients

• 3 egg whites
• 3 tablespoons sugar
• 3 egg yolks
• 3 tablespoons flour
• butter

Instructions

1. Beat the egg whites to stiff peaks.
2. Gradually mix in the sugar until the mixture resembles meringue.
3. Add the whole egg yolks and beat thoroughly again.
4. Fold in the flour gently but thoroughly—do not beat it in. Grease a mold with butter and pour the batter into it.
5. Bake in a gentle oven for just over 15 minutes.