Mediterranean Tuna Sandwich

⅓ cup pitted Kalamata olives, drained, chopped

1 clove garlic, smashed, finely chopped

1 teaspoon red wine vinegar

1 teaspoon Dijon mustard

¼ cup extra virgin olive oil

1 (5-ounce) can white, unsalted tuna packed in oil, drained 

1 tablespoon finely diced red onion

1 French baguette, preferably whole grain, center scooped out

8 fresh basil leaves

1 medium tomato, sliced

2 hard-boiled eggs, sliced