Mediterranean Grilled Tuna Sandwich Recipe

Ingredients

• 1/4 cup olive or vegetable oil
• 1 tablespoon chopped fresh or 1 teaspoon dried thyme leaves
• 1 tablespoon red wine vinegar
• 1/4 teaspoon salt
• Dash of pepper
• 1 clove garlic, finely chopped
• 1/2 pound tuna, or marlin fillets, 3/4 to 1 inch thick
• 1 medium tomato, seeded and coarsely chopped (3/4 cup)
• 1/4 medium red onion, thinly sliced
• 2 tablespoons chopped pitted kalamata or ripe olives
• 2 tablespoons chopped fresh Italian or regular parsley
• 2 teaspoons capers
• 1 loaf (1/2 pound) unsliced crusty Italian, French or sourdough bread
• 2 leaves romaine lettuce, shredded