An Apple a day keeps the Trini at Bay

I've had a special request all the way from the tropical isle of Trinidad! Apparently Trinis like apple crumble. I didn't even know you could get apples in Trinidad! (they were always rotten and expensive in Barbados so we never bothered with them!). It's a great winter favourite here in Blighty, especially when teamed with custard.
So here you go JuJu - Apple Crumble just for you!

4 large baking apples
1 tbsp lemon juice
3fl oz water
2 oz caster sugar
1/2 tsp cinnamon
handful of raisins or dried cranberries (optional)

Topping
3oz flour
1 oz porrigde oats
4 oz soft brown sugar
3 oz butter or marg

Peel, core and slice the apples into a shallow baking dish approx 6x9in. Sprinkle with the lemon juice and water, topped with the 2 oz of sugar and raisins/cranberries (if using) and the cinnamon. Combine flour, oats and brown sugar, then gently rub in the butter or marg until mixture is crumbly. Sprinkle in an even layer over the apples. Bake at M5/190C/375F for 40 minutes or until crunchy and golden brown. Serve plain or with custard. Serves 6.