Chocolate Chiffon Cake Recipe

Ingredients

• 7 large eggs, separated
• 1/2 cup baking cocoa
• 3/4 cup boiling water
• 1-3/4 cups cake flour
• 1-3/4 cups sugar
• 1-1/2 teaspoons baking soda
• 1 teaspoon salt
• 1/2 cup canola oil
• 2 teaspoons vanilla extract
• 1/4 teaspoon cream of tartar
• ICING:
• 1/3 cup butter
• 2 cups confectioners' sugar
• 2 ounces unsweetened chocolate, melted and cooled
• 1-1/2 teaspoons vanilla extract
• 3 to 4 tablespoons hot water
• Chopped nuts, optional