A classic summer entrée. If authenticity is no obstacle, upgrade the canned tuna with Grilled Fish Steaks. Just plate the dressed greens and vegetables, top each with a portion of sliced grilled tuna (or salmon), and garnish as directed.
Place in a large saucepan:
Add cold water to cover, bring to a boil over high heat, then reduce the heat to a simmer until the potatoes are tender, about 20 minutes. As the potatoes cook, prepare:
Set aside. Remove the potatoes from the boiling water with a slotted spoon and let cool. Meanwhile, add to the pan and boil until bright green but still crisp, 2 to 3 minutes:
Transfer to a bowl of ice water to stop the cooking. Let cool and drain well. Place in a medium bowl. Cut the cooled potatoes into ½-inch-thick slices and add to the beans.
Drizzle one-quarter of the dressing over the potatoes and beans and gently toss to coat. Arrange on a large platter:
Drizzle another one-quarter of the dressing on top. Arrange the green beans and potatoes on the platter, along with:
Drizzle with the remaining dressing. Scatter over the top:
Sprinkle with: