INGREDIENTS
•
2 medium-size lemons
•
2 large oranges
•
2 cups sifted all-purpose flour
•
1 1/2 cups granulated sugar
•
1 tablespoon baking powder
•
1/2 teaspoon salt
•
1/2 cup vegetable oil
•
7 large eggs, separated, at room temperature
•
1/2 teaspoon cream of tartar