Red Velvet Cheesecake

INGREDIENTS

• 1 1/2 cups chocolate graham cracker crumbs
• 1/4 cup butter, melted
• 1 tablespoon granulated sugar
• 3 (8-ounce) packages cream cheese, softened
• 1 1/2 cups granulated sugar
• 4 large eggs, lightly beaten
• 3 tablespoons unsweetened cocoa
• 1 cup sour cream
• 1/2 cup whole buttermilk
• 2 teaspoons vanilla extract
• 1 teaspoon distilled white vinegar
• 2 (1-ounce) bottles red food coloring
• 1 (3-ounce) package cream cheese, softened
• 1/4 cup butter, softened
• 2 cups powdered sugar
• 1 teaspoon vanilla extract
• Garnish: fresh mint sprigs