Blue Ribbon White Cake Recipe

Ingredients

• 5 tablespoons corn starch
• 2 1/2 cups all-purpose flour
• 3 1/2 teaspoons baking powder
• 1 teaspoon salt
• 1 1/2 cups white sugar
• 2/3 cup vegetable oil
• 1/2 cup milk
• 3/4 cup water
• 1 tablespoon vanilla extract
• 4 egg whites
• 1/4 teaspoon cream of tartar
• 6 tablespoons butter
• 2 teaspoons orange zest
• 1/4 teaspoon salt
• 4 cups sifted confectioners' sugar
• 1/2 cup fresh orange juice
• 1 tablespoon fresh lemon juice