Steaming food in parchment -- or "en papillote," as it's traditionally called -- is a low-fat way to cook a full meal in one shot: The juices from each ingredient are sealed inside the pouch to flavor the dish. Plus, it makes for a dramatic presentation. Just be careful not to burn yourself when the steam escapes!See illustrations for folding parchment paper.
We used a colorful combination of beefsteak and red, yellow, and orange cherry tomatoes, but any ripe tomatoes would work. Serve the salad as a sandwich condiment or a side dish for grilled fish or chicken.