Grilled Tuna with Mediterranean Rice Salad Recipe

1/2 cup red onion - chopped

1 pint cherry tomatoes - cut in half

1/2 red pepper - seeded and diced

1/2 cup black olives - pitted and sliced

3 tablespoons flat or regular parsley - chopped fine

1 teaspoon dried thyme

3 tablespoons white wine vinegar

1 1/2 teaspoons Dijon mustard

1 clove garlic - minced

1 1/2 teaspoons salt

ground black pepper to taste

1/3 cup plus one tablespoon olive oil

4 (1/2 inch thick) tuna steaks