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Fill a large soup pot halfway with water and 1 tablespoon of the salt. Bring to a boil.
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Use a slotted spoon to carefully lower the potatoes into the boiling water. Boil for about 15 minutes, until just fork tender.
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While the potatoes cook, make the dressing in a medium bowl. Whisk together the avocado oil, remaining 1/2 tablespoon salt, apple cider vinegar, sugar, Dijon mustard, and black pepper. Add the sliced red onion to the dressing and set aside.
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Once the potatoes are tender, use a slotted spoon to transfer them to a large bowl and let cool for about 15 minutes.
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Peel the potatoes by hand if desired and discard the peels.
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Slice the potatoes into 1/2-inch rounds and return them to the large bowl.
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Pour the dressing over the potatoes and add the parsley and dill. Toss to combine.
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Let the potato salad sit for about 30 minutes before serving. Toss again, taste, and add more salt if needed.