Best Chocolate Cake

Ingredients

• 8 ounces (227 grams) bittersweet chocolate, finely chopped
• 2/3 cup (57 grams) Dutch-process cocoa, sifted
• 2 teaspoons instant espresso powder*
• 1 cup boiling water
• 1 3/4 (222 grams) cups all-purpose flour
• 1 cup (200 grams) granulated sugar
• 1/2 cup (100 grams) packed light brown sugar
• 1 teaspoon salt
• 1 teaspoon baking soda
• 1 cup (227 grams) sour cream, at room temperature
• 1/2 cup vegetable oil*
• 4 large eggs plus one egg yolk, at room temperature
• 1 tablespoon white vinegar
• 2 teaspoons vanilla extract
• For the frosting:
• 2/3 cup (133 grams) granulated sugar
• 4 large egg whites
• 1/4 teaspoon salt
• 3 sticks (340 grams) unsalted butter, cut into 12 pieces and at room temperature
• 12 ounces (340 grams) semisweet chocolate, melted and cooled slightly
• 1 teaspoon vanilla extract

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