This also works with halibut (and probably lots of other kinds of fish).
Take a big sheet of foil and place a pound of salmon on it. Place lemon slices, onion slices, crushed garlic, tomato slices, or fresh dill sprigs on the fish. Sprinkle with a little salt and pepper. Close up the foil packet.
Make a nice hot wood fire, so that you’ll have a good bed of coals. Or use charcoal. When the coals are ready, spread them out and place a grill rack over the top.
Place the packet on the grill and roast for about 10-15 minutes.