Mash the garlic and salt to a paste with the side of a chef's knife. In a medium bowl, whisk together the garlic, mayonnaise, 1/4 cup buttermilk, parsley, chives, scallion, vinegar and pepper to taste. If the sauce is very thick, thin the dressing with a couple tablespoons more of the buttermilk. Use immediately or store covered, in the refrigerator, for up to 3 days.
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