Place half the cake cubes in a 10 (2.5 L) bowl.
Sprinkle with half the desired sherry or brandy.
Pour half the custard sauce over the cake, then spoon half the pie filling over the sauce.
Repeat all layers.
Whip cream with icing sugar; spoon or pipe over trifle.
Chill at least 3 hours. Makes 10 servings