Extreme Chocolate Layer Cake

Ingredients (17)

• ½ cup unsalted butter
• 1¾ cups all-purpose flour
• 1 cup boiling water
• ¾ cup unsweetened natural cocoa powder
• 1½ tsp baking soda
• ¼ tsp fine sea salt
• 2 cups sugar
• 3 large eggs
• 1 tsp vanilla extract
• 1¼ cups buttermilk
• FOR THE FROSTING:
• 3¾ cups confectioners' sugar
• 1 cup unsweetened natural cocoa powder
• ½ cup unsalted butter
• 1 tsp vanilla extract
• 1 cup heavy cream
• 1 tbsp sea salt