I make mine in to sauce before freezing in bags. Tip for those of you that don't already do this: when you put the sauce in the bag, have the bag in a tupper of some sort and keep it in there until the sauce is frozen. This makes it much easier for storing as you can just pile up your 'tomato bricks', whereas in the past I've had bags of sauce mold themselves through the baskets etc. making them much less space efficient!