2 cups diced plum tomatoes (about 6 tomatoes) |
1/4 cup thinly sliced green onions |
1/4 cup fresh lime juice |
2 tablespoons chopped fresh cilantro |
2 tablespoons minced seeded jalapeƱo pepper |
1 tablespoon olive oil |
2 teaspoons balsamic vinegar |
1/2 teaspoon salt, divided |
1/2 teaspoon black pepper, divided |
4 (6-ounce) tuna steaks (about 1 inch thick) |
cooking spray |
lime wedges (optional) |