Chocolate Sponge Pudding

Best served warm with it's oozing center, this is an easy to prepare dessert which can be made and frozen for a week prior to baking! I suspect the sponge should be lighter than it turned out as I have yet to get my electric beater replaced after it died and I had to cream the butter and sugar by hand. Needless to say I got a bit lazy and stopped beating before the ideal volume was achieved!