French Tuna Sub Sandwich -

Ingredients

• (1/3 cup) red onion, finely chopped
• (2 Tbsp.) niçoise olives, pitted and chopped
• (1 Tbsp.) fresh lemon juice
• (1/4 tsp.) kosher salt
• (1/4 tsp.) freshly ground black pepper
• (6 oz. can) premium oil-packed tuna, drained
• (1) hard-cooked large egg, chopped
• (1/4 cup) fresh basil, thinly sliced
• (2 tsp.) extra-virgin olive oil
• (8 oz.) whole-wheat French bread baguette, halved horizontally
• (1 clove) garlic, halved
• (1 cup) plum tomato, thinly sliced