Gluten free Delicious Apple Pudding

Here is my recipe for a delicious gluten-free apple pudding:

2 tablespoons caster sugar
1 oz butter
1 large tablespoon Rice Flour
1 tablespoon Cornflour
1.5 teaspoons baking powder
2 eggs – yolk/white separated
4 fluid ounces milk
Juice & zest 1 lemon
4 medium Bramley Apples

Peel, core and slice apples. Cook in barely enough water to cover base of pan – stirring all the time until apples are pureed. Spread in base of deep oven-proof dish (2 pint capacity or slightly larger). Cream sugar & butter; add flour, baking powder, lemon juice & zest; whisk egg whites until stiff; whisk egg yolks and milk together then whisk into mixture. Fold in egg whites. Pour onto apple puree. Bake until set – ¾ hour on Gas Mark 4 (or bake until top browns then finish off with 2 or 3 minutes in the microwave