Cocoa Chiffon Cake

Ingredients

• 2 cups sugar, divided
• 1 1/2 cups cake flour
• 2/3 cup HERSHEY’S Cocoa
• 2 teaspoons baking powder
• 1 teaspoon salt
• 1/2 teaspoon baking soda
• 1/2 cup vegetable oil
• 7 eggs, separated and at room temperature
• 3/4 cup cold water
• 2 teaspoons vanilla extract
• 1/2 tsp cream of tartar
• 1/3 cup butter or margarine
• 2 cups powdered sugar
• 1 1/2 teaspoons vanilla extract
• 2 to 4 tablespoons hot water