Preheat the oven to Gas 5, 190ºC, fan170°C. Peel, core and thinly slice the apples, and place in a 1-litre pudding basin. Sprinkle with a little of the sugar. Pour over 2tbsp boiling water.
Place the flour, sugar and oats in a mixing bowl. Add the butter and rub into the mixture until it resembles breadcrumbs. Sprinkle topping over the apples and bake for 40-45 minutes until golden brown. Serve with a spoonful of homemade custard.
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