Tuna steaks tend to get tough if you cook them too long, so take them off the grill while they are still pink in the center to keep them juicy.
1/2 cup (120 ml) balsamic vinegar
2 tablespoons (26 g) sugar
1 tablespoon (2.1 g) Italian seasoning
1/2 teaspoon (1.5 g) garlic powder
1 tablespoon (15 ml) olive oil
1 pound (455 g) tuna steaks
1 tablespoon (15 ml) lemon juice
1. Combine all ingredients except tuna and lemon juice and pour in a 9 x 9-inch (23 x 23-cm) glass baking dish.
2. Add tuna and marinate 15 minutes, turning frequently.
3. Heat grill to high. Place fish on grill and grill until medium doneness, about 3 minutes per side.
4. Place on serving plates and drizzle lemon juice over.