Ranch Dressing

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2 cloves garlic

1/2 teaspoon kosher salt 

1 cup prepared or homemade mayonnaise 

1/4 to 1/3 cup buttermilk, plus more as needed 

2 tablespoons minced fresh chives 

2 tablespoons minced flat-leaf parsley leaves 

1 teaspoon white wine vinegar 

1 scallion, trimmed and thinly sliced 

Freshly ground black pepper