4oz  butter
2ozDemerara sugar
1 drained can of pineapple rings
4oz butter
4oz marg
8oz castor sugar
8oz self raising flour
4eggs 
Pinch of salt
4 tbsp fruit syrup from canned pineapple tin

Heat oven to 180c
Melt the 4oz of butter and pour into deep tin. Sprinkle with Demerara sugar and then arrange pineapples on top of mixture. 
Cream butter and caster sugar. Add eggs, flour, salt and syrup. Spoon this mixture over fruit and bake for 35mins. Cool slightly before turning out.