Red Hot Velvet Cake with Cinnamon Buttercream from Baked: New Frontiers in Baking by Matt Lewis

Ingredients

• 1½ cups (3 sticks) unsalted butter, soft but cool, cut into small pieces
• 2 teaspoons cinnamon
• 1 teaspoon baking soda
• 1 tablespoon cider vinegar
• 1 teaspoon fine salt
• 2½ cups cake flour
• ¼ cup heavy cream
• 1½ cups milk
• ¼ cup all-purpose flour
• 1½ cups sugar
• 2 tablespoons vegetable shortening, at room temperature
• 6 tablespoons unsalted butter, softened, cut into small pieces
• ¼ cup boiling water
• 2 tablespoons red gel food coloring
• 1 teaspoon pure vanilla extract
• 1 cup buttermilk
• 3 large eggs
• 1⅔ cups sugar
• ¼ cup dark unsweetened cocoa powder