Harry’s First Birthday Cake: Chocolate Layer Cake

Name: Harry’s First Birthday Cake: Chocolate Layer Cake
Cuisine: American
Ingredients: 3/4 cup boiling water; 1/2 cup unsweetened cocoa powder; 1 teaspoon instant coffee; 1 cup all-purpose flour; 1 teaspoon baking powder; 1/4 teaspoon salt; 1 stick (8 tablespoons) butter, at room temperature; 1 cup granulated sugar; 1/2 cup packed dark brown sugar; 3 large eggs, at room tempature; 1 teaspoon pure vanilla extract; 8 ounces chopped bittersweet chocolate; 3/4 cup heavy cream; 1/4 stick (2 tablespoons) butter; 1/4 cup corn syrup; 1 stick (8 tablespoons) butter; 1 cup confectioners’ sugar; 1 tablespoon heavy cream; 1 teaspoon pure vanilla extract (and 1/2 of the above Chocolate Glaze recipe); 1 cup confectioners’ sugar; Water to form a paste; Green food coloring