What I love about TFDs is that you can make them so unique. Really, you could do almost anything with them.
You start with a bed of cabbage (to protect the meal) on a large piece of heavy duty tin foil and then place a hamburger on the cabbage. But you could use chicken, fish, more veggies or anything really! You can then put in any kind of flavoring that you desire. I love salt and pepper, but you could use dressings, other spices, etc. Cover all of that with sliced potatoes (to protect the meal again) and seal up your tin foil.
Make sure that you have a fire with lots of hot coals, and place the meal in the fire. Time will vary with the intensity of the coals, but generally the meal should cook in about 16 minutes - 8 minutes on a side. Open it up, check to make sure your meat and veggies are done, and enjoy!
Some people on staff get really tired of having this meal every week, but I'm going on 10 summers and it is still one of my favorites :)