Preheat oven to 400°.
Bring water to a boil in a medium saucepan. Add cabbage leaves; cook 30 seconds. Remove from water; set aside.
Melt margarine in a large nonstick skillet over medium-high heat. Add sliced cabbage and onion; sauté 5 minutes. Stir in the broth and clam juice; cook over medium-high heat 15 minutes or until liquid evaporates.
Place 1 salmon fillet in center of each cabbage leaf. Sprinkle fillets with salt and pepper. Top each fillet with 1/4 cup broth mixture. Fold cabbage leaves over fillets. Place wrapped salmon, seam sides down, in an 11 x 7-inch baking dish.
Cover baking dish with foil. Bake at 400° for 25 minutes or until fish flakes easily when tested with a fork.
Arrange wrapped salmon on a platter. Sprinkle chopped tomato and chives over salmon.