Put the potatoes in a 4-quart saucepan, cover with 2 quarts water, add 1 Tbs. salt, and bring to a boil over high heat. Reduce the heat to medium and simmer gently until the potatoes are just tender when poked with a skewer, about 5 minutes. Using a slotted spoon, transfer the potatoes to a large bowl (save the cooking liquid).Whisk the vinaigrette to recombine, drizzle 2 Tbs. of it over the potatoes, sprinkle with salt and pepper, and toss well. Set aside and let cool to room temperature.
Bring the water in the saucepan back to a boil over high heat. Meanwhile, fill a large bowl with ice water. Drop the green beans into the boiling water and cook until bright green and no longer raw but still very crisp, 1 to 2 minutes. Drain the beans in a colander and plunge them into the ice water to stop the cooking. Drain again and spread the beans on a clean dishtowel to dry.
When the potatoes have cooled, add the green beans, tomatoes, onion, fennel, and all but 3 Tbs. of the vinaigrette and toss well. Season to taste with salt and pepper. Add the arugula and toss gently. Transfer to a platter and top with the salmon. Drizzle with the remaining vinaigrette and serve.
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