Amber

“2 ounces chopped bittersweet chocolate 1 tablespoon instant coffee 1¼ cups boiling water 2¾ cups all-purpose flour 2¾ cups granulated sugar ¾ cup unsweetened cocoa powder ½ teaspoon salt 2 teaspoons baking soda 1 teaspoon baking powder 1 cup vegetable oil 1¼ cups buttermilk 4 large eggs 2 teaspoons pure vanilla extract Preheat the oven to 350°F. Grease and flour a 9″ × 13″ cake pan. Place the chocolate and coffee in a small bowl. Pour the boiling water over the chocolate and coffee and let it stand 5 minutes. Whisk until smooth. Using an electric mixer, combine the flour, sugar, cocoa powder, salt, baking soda, and baking powder in a large bowl. Mix on low speed until well combined. Add the oil and buttermilk and mix well, scraping down the sides as needed. Add the eggs one at a time, beating after each until incorporated. Add the chocolate-coffee mixture very carefully, on the lowest speed, as it will slosh around the bowl. Add the vanilla. Finish by scraping the bowl down and mixing all the batter with a rubber spatula. Scrape the batter into the prepared pan and bake for about 45 minutes, until the cake feels firm when touched lightly in the center or a toothpick inserted in the center comes out with a few moist crumbs attached. If the toothpick comes out clean, the cake is over baked. Cool the cake completely in the pan on a wire rack. Dust with confectioners' sugar and serve right out of the pan.”
― Dinah Bucholz, The Unofficial Harry Potter Cookbook: From Cauldron Cakes to Knickerbocker Glory--More Than 150 Magical Recipes for Wizards and Non-Wizards Alike