Arrange fish fillet on a sheet of aluminum foil. Bring edges of foil up to form a bowl. Spoon 2 tablespoons of sauce over each fillet. Arrange foil packets in a baking dish. Steam at 450 F 8-10 minutes, or until fish flakes easily when tested with a fork.
Heat remaining sauce, serve with fish.
Recipe borrowed from Choices for a Healthy Heart by Joseph C. Pisccatella. Arrange swordfish in a shallow dish. Layer cubed fennel bulb and half the chopped fennel greens over and around swordfish. Let stand 1 hour at room temperature. Cover the grill grid with foil.