Nicoise Salad With Seared Tuna Ingredients Vinaigrette: 2 garlic cloves, minced 1 teaspoon Dijon mustard 3 tablespoons red wine vinegar 1/2 lemon, juiced 2 tablespoons chopped fresh flat-leaf parsley 2 tablespoons minced fresh tarragon Sea salt and freshly ground black pepper 1/2 cup extra-virgin olive oil Salad: 1 pound small red new potatoes, scrubbed and