This delicious quiche is unusual in that it has a lot more vegetables than custard. It is great both warm and at room temperature. The recipe is from Dorie Greenspan's wonderful cookbook, "Around My French Table: More Than 300 Recipes from My Home to Yours". If the sides of your tart pan are not very high or if your crust has shrunk, you might not be able to get all the custard into the pan. If you think you've got a short-sided crust, make a smaller amount of custard using 1/2 cup heavy cream and 1 egg. You can also try this as a crustless quiche.