Use a large square piece of aluminum foil for each tin foil dinner. Spray foil with nonstick cooking spray.
Separate ground beef into 4 equal patties, or steak into 4 servings, and place in the center of each piece of foil.
Divide potatoes, carrots, and onion evenly between all 4 dinners and place on top of meat. Sprinkle with salt and pepper, to taste. Pour a few dashes of Worcestershire sauce on top of each dinner and fold foil up tightly around the entire meal.
Cook on a grill on medium-high heat or an open fire for 25-30 minutes, or until vegetables and meat are cooked through.
Open foil carefully and top with BBQ sauce and shredded cheese.