Name: Chocolate Guinness Layer Cake
Ingredients: Butter, for prepping cake pans; Flour, for prepping cake pans; 7 oz. 72% dark chocolate, chopped (about 1 ½ cups); 1 cup unsalted butter; 1 (11.2 oz.) bottle Guinness Draught; 3 ¼ cups granulated sugar; 4 eggs + 2 yolks; ¼ cup canola oil; ⅔ cup sour cream; 3 cups all-purpose flour; 1 Tbsp. baking powder; 1 Tbsp. + 1 tsp. instant espresso powder, divided; ¾ cup unsweetened cocoa powder; 1 tsp. kosher salt; 1 lb. bittersweet chocolate, chopped; 2 cups heavy whipping cream