Chocolate Pie - Alabama Farmers Federation

Ingredients

• 1 pie shell, baked and cooled
• 1 cup sugar
• 3 tablespoons cornstarch
• 1/4 teaspoon salt
• 2 tablespoons cocoa powder
• 3 eggs, separated
• 2 cups milk
• 1 tablespoon vanilla extract
• 2 to 3 tablespoons butter
• 1/4 teaspoon cream of tartar