Method 
Cream butter and sugar until they are pale, add 1 egg at a time beat well add vanilla essence, then make a paste of cocoa, food coloring and viniger and add it to the margarine batter and then add flour, bicab, and baking powder and alternatively add buttermilk then lastly bake at 180 degrees for 35minutes and let it cool 

Method cheese cake
1 cream cheese tub
1 tin condensed milk
1/4 cup lemon juice
1tsp vanilla essence

Method
Beat cream cheese until it is smooth, then add condensed milk and lemon juice and vanilla essence mix it well until it become a biy thick then cut ur red velvet sponge in ur desirable size and grease ur dish or the pan u will be using and pour ur cheese mixture and the n grate ur cake and put on top of ur cheesecake refrigirate for 6hours.