Place a greased 9-in. springform pan on a double thickness of heavy-duty foil (about 18 in. square). Securely wrap foil around pan. , In a small bowl, combine the cookie crumbs, butter and sugar. Press onto the bottom of prepared pan., In a large bowl, beat cream cheese, sugar, sour cream, buttermilk, cocoa and vanilla until smooth. Add eggs; beat on low speed just until combined. Stir in food coloring. Pour over crust. Place springform pan in a large baking pan; add 1 in. of hot water to larger pan. , Bake at 325° until center is just set and top appears dull, 60-70 minutes. Remove springform pan from water bath. Cool on a wire rack for 10 minutes. Carefully run a knife around edge of pan to loosen; cool 1 hour longer. Refrigerate overnight, covering when completely cooled. Remove sides of pan., For frosting, in a small bowl, beat cream cheese and butter until fluffy. Add confectioners’ sugar and vanilla; beat until smooth. Frost top of cheesecake. Refrigerate until serving.