Foods baked in aluminum foil packets retain the maximum of their natural moisture and flavor. The packets can be arranged and sealed in advance of cooking, leaving the host free to spend time with his or her guests. And finally, the silvery envelopes look terrific cut open at the table, releasing their savory steam.
Cut the foil into a large heart shape, or use a simple rectangle. Arrange the meat or fish and garnishes inside and fold the foil over, sealing well on all sides. When arranging food in packets, do not overlap the meat or fish pieces or they will not cook evenly. If the packets are prepared far in advance and refrigerated, be certain to let the foods return to room temperature before cooking. If you prefer to use classic cooking parchment rather than foil, butter it well and reduce the cooking times slightly.