Devil's Food Cake with Mocha Buttercream Frosting

Ingredients

• 2 cups Flour
• 1 1/2 cups Ghirardelli Sweet Ground Chocolate and Cocoa
• 1 cup Granulated sugar
• 1 teaspoon Baking soda
• 1/2 teaspoon Cream of tartar
• 1/2 teaspoon Salt (optional)
• 1 1/2 cup Buttermilk
• 1 cup Butter, softened
• 4 Eggs
• 1 teaspoon Pure vanilla extract
• 4 ounces Ghirardelli 100% Cacao Unsweetened Chocolate Baking Bar
• 2 tablespoons Boiling water
• 2 teaspoons Granulated instant coffee
• 2/3 cup Butter, softened
• 2 cups Confectioners sugar
• 1/3 cup Milk
• 1 1/2 teaspoons Pure vanilla extract