Pan Bagnat: Le French Tuna Salad Sandwich

Name: Pan Bagnat: Le French Tuna Salad Sandwich
Ingredients: 1/2 loaf crusty French baguette; 1 clove garlic, cut in half; 4 to 6 basil leaves; 1 (6oz) can tuna; 3/4 cup Nicoise or Kalamata olives, sliced; 1/2 cup red bell pepper, seeded and sliced thin; 1/2 small red onion, finely chopped; 1/4 cup Italian flat leaf parsley, finely chopped; 1 jar or can artichoke hearts, drained and chopped (optional); 1/4 cup blanched French green beans, sliced into thirds (optional); 3 tablespoons fresh lemon juice; 6 tablespoons extra virgin olive oil, plus more for drizzling; 1 pinch sea salt and freshly ground black pepper, to taste