Marble Cake

Bahan-bahan (16 porsi)

• ½ cup natural unsweetened cocoa powder, (such as Hershey's)
• 2½ cups sugar, (divided)
• ½ cup water
• 4 oz semi-sweet chocolate, (best quality such as Ghirardelli, broken into 1-in pieces)
• 1 cup buttermilk ((see note))
• 4 large eggs
• 2 teaspoons vanilla extract
• 3 cups all-purpose flour, (spooned into measuring cup and leveled-off)
• 1 teaspoon baking powder
• ½ teaspoon baking soda
• ¾ teaspoon salt
• 1 cup (2 sticks) unsalted butter, softened
• 5 tablespoons unsalted butter
• ¾ cup sugar
• ¼ cup water
• 2 teaspoons vanilla extract