Preheat grill to medium.

In small bowl, whisk together vingear, oil, shallot, and mustard.

Season tuna with salt and pepper to taste. Grill tuna, turning, until golden brown and cooked through, 8 to 10 minutes.

Arrange romaine, green beans, tomatoes, potatoes, onion, berries , olives, and tuna in 4 bowls. Drizzle with vinaigrette.