Ingredients

  • 2 1/4 cups sugar
  • 4 ounces (4 squares) unsweetened chocolate
  • 1 1/2 teaspoons vanilla extract
  • Nonstick cooking spray, for greasing cake pans
  • 3 cups cake flour, sifted
  • 4 1/2 teaspoons baking powder
  • 3/4 teaspoon salt
  • 1 cup (2 sticks) butter, room temperature
  • 4 large eggs, room temperature
  • 3/4 cup whole milk
  • Divinity Icing, recipe follows
  • 3 large egg whites, room temperature
  • Pinch salt
  • 3 cups sugar
  • 3 tablespoons white corn syrup
  • 3/4 teaspoon white vinegar
  • 1/3 cup mini marshmallows (about 30)
  • 1 1/2 teaspoons vanilla extract

Method

  • In a small saucepan, combine 1 cup water, 1/2 cup of the sugar, the chocolate and the vanilla.
  • Heat over medium heat, stirring constantly, until melted.
  • Set aside to cool.
  • Preheat the oven to 350 degrees F.
  • Prepare three 9-inch round cake pans: spray the bottom and sides of each pan with cooking spray; line the pans with parchment paper; then spray again with cooking spray.
  • Sift together the flour, baking powder and salt.
  • In a stand mixer, cream the butter and the remaining 1 3/4 cups sugar until smooth.
  • Add the eggs, one at a time, beating after each addition.
  • Add the cooled chocolate mixture and beat until smooth.
  • Add the sifted flour mixture alternately with the milk, starting with a third of the flour, then adding half the milk, and ending with the flour.
  • Stir only enough after each addition to blend the ingredients.
  • Pour the batter evenly into the cake pans and bake for 35 minutes, or until done.
  • Judge doneness by appearancelayers will begin to pull away from the sidesor by inserting a toothpick into the center of a layer.
  • The toothpick should come out clean.
  • Cool the cakes in the pans for 10 minutes, then turn them out onto racks.
  • Remove the paper and allow to cool completely before frosting.
  • Spread the Divinity Icing between the layers and all over the top and sides of the cake.
  • Pour the egg whites and salt into a stand mixer fitted with a whip attachment.
  • Beat the egg whites until smooth but not stiff; they should not form stiff peaks.
  • In a large saucepan, mix the sugar, 3/4 cup water, corn syrup and vinegar.
  • Stir until the sugar dissolves, then heat the mixture until it reaches the hard ball stage (265 degrees F on a candy thermometer), about 12 minutes.
  • When done, the syrup will spin a long thread when poured off the edge of a spoon.
  • Remove the syrup from the heat and stir in the mini marshmallows.
  • The mixture will be foamy.
  • With the mixer running at high speed, stream the syrup into the egg whites.
  • Beat well, and then beat in the vanilla.