1Mix margarita mix, lime juice and garlic in shallow glass or plastic dish. Add fish steaks; turn to coat. Cover and refrigerate at least 1 hour but no longer than 24 hours.
2Set oven control to broil. Remove fish from marinade; set aside marinade. Place fish on rack in broiler pan. Brush with marinade; sprinkle with 1/4 teaspoon of the salt. Broil fish with tops about 4 inches from heat 5 minutes.
3Carefully turn fish. Brush with remaining marinade; sprinkle with remaining 1/4 teaspoon salt. Broil 4 to 6 minutes longer or until fish flakes easily with fork. Toss strawberries and pretzels; serve over fish.