Preheat oven to 400 degrees.  Slice onions and potatoes.  On a large sheet of foil (big enough to enclose pile of food) make a quarter pound of ground turkey into a patty.  Salt and pepper patty. Pile onions, poatoes and carrots on top finishing with a pineapple ring and tablespoon of butter on top.  Fold up edges and place on a cookie sheet. Repeat 3 more times.  This can be either grilled or baked in the oven (my choice) @ 400 degrees for 45 minutes.  You can also add a 1/2 teaspoon of minced garlic into ithe mix for more flavor or a generous dousing of worchestershire sauce.  Serves 4.