Filling: heat 1 cup of milk and stir in 24 large marshmallows, stirring until dissolved; add 1 can (7 oz.) coconut and spread on cooled cake.

Chocolate sauce: mix together and boil 1/2 cup milk, 1 stick butter, 1/4 cup white corn syrup, 2 cups sugar and 2 squares semi sweet chocolate. Beat until thickened slightly. Punch holes in cake with fork and pour sauce over cake.