Tarts are ever so much fussier than pies, don’t you think? Because of handy tart molds, the crusts are easier to finish off. An elegant dessert that is creamy and piquant at the same time. For a lighter filling, you can whip the egg whites separately and fold into the filling but it is not necessary. Key Lime Tart alas, is what the protagonist threw at her husband at the end of the book and subsequent film, Heartburn, which starred Meryl Streep and Jack Nicholson as the philandering husband (who, it must be said, deserved at least, Key Lime Pie being thrown at him. Mind you, it's a terrible end of a great bit of baking)