A quiche is an open-faced tart with a savoury custard filling. Most widely known is quiche lorraine, which traditionally contains only eggs, cream or milk, and bacon or ham. The classic quiche lorraine contains no cheese, but a few tablespoons of grated cheese can be added to the egg mixture, if desired. Other quiche fillings may include cheese, tomatoes, onions, crabmeat, smoked salmon, mushrooms or other vegetables. There should be a lot of creamy filling encased in thin pastry shell.