Directions: 1. Lay steaks flat in a dish. Mix soy sauce and lemon juice and pour over steaks. Allow to marinate for at least 10 minutes. 2. Drizzle a bit or olive oil over spinach. Salt and pepper to taste. Divide spinach onto 4 plates. 3. Pour sesame seeds onto a plate and press both sides of each tuna steak into seeds. Heat pan with sesame oil. Sear each tuna steak in pan for about 2 minutes on each side. 4. To serve, cut steaks into slices and place on top of spinach.