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Ingredients
US|METRIC
8 SERVINGS
- 3 1/2 cups all purpose flour
- 2 cups cocoa powder (good)
- 1 Tbsp. bicarbonate of soda
- 1/2 tsp. kosher salt
- 1 1/2 cups unsalted butter (at room temperature)
- 1 1/3 cups granulated sugar
- 1 1/3 cups light brown sugar (packed)
- 4 large eggs (extra-, at room temperature)
- 4 tsp. pure vanilla extract
- 2 cups buttermilk (at room temperature)
- 1 cup sour cream (at room temperature)
- 1/4 cup coffee (brewed)
- chocolate buttercream frosting (recipe follows)
- 455 grams bittersweet chocolate
- 340 grams semisweet chocolate
- 3/4 cup egg whites (4 to 5 extra-large eggs, at room temperature)
- 1 1/2 cups granulated sugar
- 1/4 tsp. cream of tartar
- 3/4 tsp. kosher salt
- 680 grams unsalted butter (at room temperature)
- 3 tsp. pure vanilla extract
- 3 tsp. instant espresso powder (dissolved in 1½ tsps water)
- 3 Tbsp. dark rum (optional)
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