"Using mayonnaise in a chocolate cake recipe might seem a bit strange to you, but it's just one of those things you absolutely have to try. This vintage recipe for 1950s Chocolate Mayonnaise Cake is one of those recipes that will take you back in time. Using mayonnaise makes the cake incredibly moist, and the result will be possibly one of the best chocolate cakes you've made. Try this old-fashioned recipe once and you'll make it again and again...."