Tuna and Potato Salad

Name: Tuna and Potato Salad
Ingredients: 2 Yukon Gold potatoes, peeled and cut into 1/2-inch pieces; 1 medium carrot, peeled and cut into 1/4-inch pieces; 1/2 cup frozen baby peas; 1/4 cup plus 2 tablespoons mayonnaise; 2 tablespoons crème fraîche; 1 tablespoon Dijon mustard; 2 tablespoons fresh lemon juice; Salt and freshly ground pepper; 1/4 cup coarsely chopped flat-leaf parsley; 2 tablespoons snipped chives; One 6-ounce can or jar solid white tuna in olive oil, preferably Spanish or Italian, drained and flaked; 2 tablespoons extra-virgin olive oil; 4 ounces baby arugula (4 cups)