Barefoot Contessa (en-US)

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3 scallions, white and green parts, chopped
½ cup chopped fresh basil leaves, lightly packed
2 tablespoons freshly squeezed lemon juice
1½ tablespoons Dijon mustard
1 tablespoon good olive oil
2 garlic cloves, chopped
2½ teaspoons kosher salt
1 teaspoon freshly ground black pepper
1 cup good mayonnaise
½ cup Greek-style yogurt, such as Fage Total
½ cup buttermilk, shaken

Place the scallions, basil, lemon juice, mustard, olive oil, garlic, salt, and pepper in the bowl of a food processor fitted with the steel blade. Purée for 15 to 20 seconds to make a smooth mixture. Add the -mayonnaise, yogurt, and buttermilk and blend until smooth. Transfer the dressing to a container, cover, and refrigerate for 1 hour for the flavors to develop.

Buttermilk Ranch Dressing