BAKED APPLE CUSTARD

8 large apples, moist sugar to taste, half a teacupful of water and the juice of half a lemon, 1 pint of custard made with Allinson custard powder. Peel, cut and core the apples and put into a lined saucepan with the water, sugar, and lemon juice, stew till tender and rub through a sieve; when cold put the fruit at the bottom of a pie-dish and pour the custard over, grate a little nutmeg over the top, bake lightly, and serve cold.