Put the potatoes in a large pot and add water to cover; season with salt. Bring to a boil, then reduce the heat and simmer until just tender, 10 to 12 minutes. Drain and transfer the potatoes to a large bowl. Add the vinegar and 1 teaspoon salt and toss. Let cool.
Bring a saucepan of salted water to a boil. Add the snap peas and cook until crisp-tender, 1 minute. Transfer to a bowl of ice water, then drain and halve lengthwise.
Whisk the mayonnaise, sour cream, horseradish, mustard, 2 tablespoons water and the lemon zest in a bowl; season with salt and pepper. Gently stir into the potatoes along with the snap peas, celery, dill, chives and parsley.
Tools You May Need
Photograph by Ryan Dausch
Tools You May Need
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