Preheat the grill. Oil and season the tuna. Grill the tuna for 1-2 minutes on each side. Toss the lettuce with 1/4 cup of Aioli dressing and season with salt and pepper. Place in the center of your salad plates. Arrange the rest of the ingredients in a pretty way. Top with the beautiful tuna steak, and drizzle all over with the remaining dressing. Garnish with the olives.