
In a small bowl, whisk together vinegar, tarragon, mustard, shallot, salt and pepper. Slowly whisk in oil to make a vinaigrette.
Put tuna into a wide, shallow dish, drizzle all over with 2 tablespoons of the vinaigrette, cover and chill for 30 minutes. Reserve remaining vinaigrette.
Prepare a grill for medium heat cooking. Arrange tuna on the grill and cook 5 to 7 minutes on each side, or until tuna reaches desired doneness. Transfer to a plate. When cool enough to handle, flake into large pieces.
Arrange tuna, potatoes, green beans, tomatoes, olives, onion and egg on a large platter and serve with reserved vinaigrette on the side to spoon over the top.
I put on a bed of romaine lettuce and tossed
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