I used to freeze them since we got masses of fruit from our own orchards. I would rub a layer of melted butter on the bottom shells before adding the filling. And be sure to close out all the air.
They are lovely in the middle of a cold winter with the wind howling and hurling branches at the house and rain pelting against the windows..makes a home smell like a home should. DH and kids would hang around the kitchen, all with plates and forks in hand...