1. Heat oil in a large skillet over medium-high heat. Add fish, and cook 4 to 5 minutes on each side or until fish flakes easily when tested with a fork. Remove fish from pan; keep warm.
2. Add onion and garlic to pan; sauté 5 minutes or until tender and golden. Add olives and next 5 ingredients; simmer 10 minutes or until sauce is thickened. Return fish to pan; cook until thoroughly heated. Serve fish over sauce.