1 clove garlic
1/2 teaspoon kosher salt
1 cup mayonnaise
1/3 cup buttermilk
2 tablespoons minced fresh flat-leaf parsley
2 tablespoons minced fresh chives
1 scallion (white and green parts), thinly sliced
1 teaspoon white wine vinegar
Freshly ground black pepper
Smash the garlic clove, sprinkle with the 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, add the remaining ingredients, and whisk well to make a creamy dressing.
Use immediately or refrigerate in a tightly sealed container for up to 3 days.