4 fillets of salmon, about 6 ounces each1 teaspoon saltFreshly ground pepperJuice and zest of 1 orange½ teaspoon each, crushed: red pepper flakes, fennel seeds½ stick (¼ cup) butter, cut into piecesPrepare a grill for high heat.Spray four squares of aluminum foil with olive oil or non-stick cooking spray.Place 1 salmon fillet on each square. Sprinkle the fish with salt, pepper, orange juice and zest, red pepper and fennel seeds. Dot each fillet with butter.Bring the sides of the foil up around the fish; fold over to seal the packet tightly, but leaving room for heat and steam to circulate inside.Grill until the fish is just cooked through, about 15 to 20 minutes.Place packets on plates; carefully unwrap.