Apple Puff Pastry Dessert

Chop apples and toss in cornflour (this ensures a nice thick sauce inside the pastry case, and NOT a runny liquid oozing everywhere)
Cook apples in melted butter, add sugar and cinnamon, walnuts

Encase in puff pastry.  Seal with water, brush with egg or milk. Sprinkle liberally with sugar.
Bake till done.  Super easy with shop-bought pastry (which I always have in the freezer).
Enjoy