Grammie's Prune Cake

Whole 9"x13" cake.  Vegetarian.  This dessert is ready-to-eat.  This is the best cake you will ever eat.  Buttermilk caramel frosting is poured over this moist cake while it is still hot, soaking through giving it a decadent texture that is unbeatable.  Don't let the prunes scare you, this is the best dessert on the planet.