Ree was given this chocolate cake recipe by her mother-in-law Nan, and she has used it many, many times over the years. It’s a very versatile recipe that you can make in a sheet pan, a 9-by- 3-inch casserole or as cupcakes. And the 7-minute frosting really does take 7 minutes to whip!
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Directions
For the cake: Preheat the oven to 350 degrees F and grease and flour a 9-by-13-inch baking dish.
In a mixing bowl, combine the flour, sugar and salt, then set aside.
Melt the butter in a saucepan, then add the cocoa and stir to form a paste. Add the boiling water and boil the mixture for 30 seconds, then remove from the heat.
Pour the hot butter and cocoa mixture into the flour, stirring it to cool slightly as it combines.
Add the buttermilk, baking soda, vanilla and eggs to a pitcher and stir. Add the buttermilk mixture to the flour mixture and combine. Pour into the prepared baking dish.
Bake until a toothpick inserted in the center comes out clean, 24 to 26 minutes. Let cool completely.
For the frosting: Add the sugar, cream of tartar, egg whites, salt and 3 tablespoons water to a heavy-bottomed stainless steel pot. Place the pot over medium-low heat. With an electric mixer, beat the mixture constantly until the sugar dissolves, 5 minutes or so. Add the vanilla bean paste and continue mixing until it is incorporated and the mixture is thick and glossy, about 2 minutes.
Spoon the frosting over the cake and spread almost to the edge, leaving the sides unfrosted.
Shave over some of the bittersweet chocolate bar, then slice and enjoy.
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