Put the potatoes and 1/2 cup salt in a large saucepan. Cover by about 1 inch with cold water. Bring to a boil, lower the heat and simmer until the potatoes are fork tender, 5 to 8 minutes. Drain the potatoes and return to the pot. Set aside to dry so the salt crystalizes, about 5 minutes. Keep warm.
Divide the potatoes among 4 plates. Drizzle with some Ranch Dressing and sprinkle with some bacon and scallions.
Smash the garlic on a cutting board, sprinkle with 1/2 teaspoon salt, and, with the side of a large knife, mash and smear the mixture to a coarse paste. Scrape the paste into a small bowl and add the mayonnaise, buttermilk, chives, parsley, vinegar, scallion and black pepper to taste. Whisk well to make a creamy dressing. Use immediately or refrigerate in a tightly sealed container for up to 3 days.
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