Ingredients
- 4 oz unsweetened chocolate
- 1 cup dutch-processed dark cocoa powder
- 1 cup hot coffee
- 2 1/4 cups all-purpose flour
- 1 1/2 cups granulated sugar
- 1/4 cup brown sugar
- 2 tsp baking soda
- 1 1/4 tsp kosher salt
- 1 tsp baking powder
- 2 large eggs
- 2 large yolk
- 3/4 cup buttermilk
- 1/2 cup vegetable oil
- 1/2 cup mayonnaise
- 2 tsp vanilla extract
- 24 oz dark chocolate chips
- 1 cup heavy cream
- 2 1/4 cups unsalted butter
- 1 1/2 cups dutch-processed cocoa powder
- 4 1/2 cups powdered sugar
- 4 1/2 tbsp light corn syrup
- 1 pinch kosher salt
- 3 tsp vanilla extract
Steps
- Heat the oven to 350 F and grease two 9-inch round cake pans.
- Stir the chopped chocolate and hot coffee together until melted, then whisk in the cocoa powder.
- Mix the flour, sugars, baking soda, salt, and baking powder in a large bowl.
- Whisk in the eggs, yolks, buttermilk, oil, mayonnaise, vanilla, and chocolate mixture until smooth.
- Divide the batter between the pans and bake for 28 to 32 minutes, until a tester comes out clean.
- Cool the cakes for 15 minutes, then remove them from the pans and cool completely.
- Heat the cream until steaming, pour it over the chocolate chips, and stir in the butter, cocoa, powdered sugar, corn syrup, salt, and vanilla before frosting the cake.
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