Place pie apple in a greased pie dish and add a pinch or two or cinnamon. I also sprinkle some brown sugar over the pie apple.
Rub together sugar, flour and butter so the texture resembles son mixture, then crumble.
Place the crumble on top of the pie pieces and heat in a moderate oven until the crumble mixture has turned a warm brown.
Serve with custard, cream and ice-cream. (You can add coconut, rolled oats or muesli to make the crumble).