In food processor cream butter and sugar, add egg and self raising flour. Cover with topping and bake 55-60 minutes 180 C until firm and set. Dust with icing sugar and serve with cream. Rhubarb can be substituted with raspberries, blackberries, gooseberries, or feijoas adjusting sweetening accordingly. Easy to make and always a winner for winter entertaining.
Any leftovers are great with a cup of coffee the next day.