Heat 1 Tablespoon oil in large, deep fry pan or stockpot over medium heat. Stir in garlic and pancetta and cook 1 to 2 minutes. Remove pancetta from pan; hold aside.
Rinse any ice glaze from frozen seafood fillets under cold water; pat dry with paper towel. Brush both sides of fillets with remaining oil. Place fillets in pan and cook, uncovered, over medium-high heat about 3 minutes, until browned. Shake pan occasionally to keep fish from sticking.
Turn fillets over and sprinkle with lemon-pepper. Cover pan tightly and reduce heat to medium. Cook an additional 2 to 5 minutes. Adjust cook time for smaller fillets. Cook just until fish is opaque throughout. Remove fillets to platter; keep warm.
Add water, spinach and pancetta to pot; cover and cook a few minutes, just until spinach is wilted. Stir to blend flavors and heat through.
To serve, portion about 1/2 cup spinach blend onto each plate. Top with a seafood fillet and 1/2 tablespoon tapenade or 1 tablespoon olives.