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 onions or 1/4 cup sweet spanish onion, finely chopped |
1/4 cup red bell pepper, finely chopped (optional) |
3 tablespoons mayonnaise (optional) or 3 tablespoons low-fat mayonnaise (optional) |
2 teaspoons capers (more to taste) |
1/4 teaspoon fresh ground black pepper |
4 romaine lettuce leaves or 4 curly green lettuce leaves |