How to Make It
Melt butter in large, heavy nonstick skillet over medium heat. Add nuts and 2 tablespoons lemon juice, and stir; cook 1 minute or until nuts are golden brown. Remove from pan and set aside.
Season fish with salt and pepper. Add 2 teaspoons oil to skillet over medium-high heat. Add fish; cook 2 minutes per side, until it flakes. Transfer to platter; place nuts on top of fish. Tent with foil to keep warm.
Wipe skillet clean with a paper towel. Warm remaining 1 teaspoon oil over medium heat. Add garlic and spinach; cook 5 minutes, stirring until spinach wilts. Add remaining lemon juice; cook 1 minute to blend flavors. Place spinach on serving platter; top with fillets. Serve with lemon wedges.