Sponge Cake with Blueberry Topping - Master recipes

Ingredients

• 6 large eggs, separated -
• 1-1/2 cups sugar -
• 3/4 cup orange juice -
• 1-1/2 cups all-purpose flour -
• 1-1/2 teaspoons baking powder -
• 1/4 teaspoon cream of tartar -
• BLUEBERRY TOPPING: -
• 1/2 cup sugar -
• 2 teaspoons cornstarch -
• 1 tablespoon grated orange zest -
• 1/2 cup orange juice -
• 2 cups fresh or frozen blueberries -
• SOUR CREAM TOPPING: -
• 2 cups sour cream -
• 1 tablespoon confectioners' sugar -
• 1 teaspoon vanilla extract -
• Grated orange zest, optional -