You can use store bought puff pastry or another pastry of your choice. This recipe is for a standard 10-inch tart pan. You will want to make a lot of the smoked onions as they are great to have around for things like salad, pizza and pasta. I recommend pouring the St. Francis Cabernet with this dish because the crisp fruit of the wine balances the richness and deep flavors in the tart. I enjoy that tart with several of our red wines as well.