Coffee Cake. Literally.

INGREDIENTS

• 2 cups all-purpose flour
• 2 cups white sugar
• 1/4 teaspoon salt
• 1 cup butter
• 3 tablespoons instant coffee granules
• 1 cup boiling water
• 1/2 cup buttermilk
• 2 eggs
• 2 teaspoons vanilla extract
• 1 teaspoon baking soda
•  
• 3/4 cup butter, softened
• 3 cups confectioners' sugar
• 1 tablespoon instant coffee granules, or more to taste
• 2 tablespoons heavy cream, plus more as needed