Boil the potatoes in heavily salted water until just tender (careful not to overcook). Drain in a colander and let potatoes cool slightly so you can handle with ease. Cut potatoes into quarters or halves depending on desired bite size and place them in a large bowl.
While potatoes are boiling- Make the vinaigrette- Whisk together the vinegar, mustard, garlic, egg yolk, 1 teaspoon salt, and many grinds of black pepper. Whisking constantly and vigorously, pour the oil in a thin drizzle, making an emulsion. Stir in the wine and capers (I used salt packed capers so I cut back on the salt elsewhere in the recipe).
Assemble your salad- While the potatoes are still very warm, pour half the vinaigrette on the potatoes and toss them gently, allowing them to soak up the vinaigrette. Stir in the scallions, celery, red onion, lobster, and add enough vinaigrette to moisten. Add the zest and juice of the lemon, the tarragon or parsley, and more salt (if needed) and pepper to taste.
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