Ingredients

• 4 teaspoons roasted red pepper olive oil
• 4 teaspoons balsamic vinegar
• 8 slices whole grain bread or 8 slices pita bread
• 2 (6 ounce) cans tuna in water, drained and flaked
• 1/3 cup sun-dried tomato packed in oil, drained
• 1/4 cup ripe green olives or 1/4 cup ripe olives, sliced
• 1/4 cup red bell pepper, finely chopped
• 3 tablespoons mayonnaise or 3 tablespoons low-fat mayonnaise
• 2 teaspoons capers (more to taste)
• 1/4 teaspoon fresh ground black pepper
• 4 romaine lettuce leaves or 4 curly green lettuce leaves
• 1/4 cup red onions or 1/4 cup sweet Spanish onion, finely chopped