Pour oil into pot. Set to STOVETOP HIGH AND HEAT OIL. Add fish to oil and cook uncovered 5 minutes. Turn fish over and cook 2 minutes more. Remove fish from pot.
Add garlic to pot. Cook uncovered 1 minute, stirring often. Stir in tomato, red pepper, olives,capers and oregano. Place roasting rack into pot. Place fish on rack. Set OVEN to 350 degrees F for 6 minutes. Cover and cook until fish flakes easily when tested with fork. Serve fish with sauce.