Ingredients

• 1/2 cup mayonnaise
• 1/3 cup well-shaken buttermilk
• 2 tablespoons white-wine vinegar
• 1/4 cup coarsely chopped flat-leaf parsley
• 2 scallions, white and pale green parts chopped and greens finely chopped (reserve separately)
• 1 teaspoon anchovy paste
• 2 tablespoons finely chopped tarragon

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Instructions

1. Pulse mayonnaise, buttermilk, vinegar, parsley, white and pale green parts of scallion, anchovy paste, and 1/4 teaspoon each of salt and pepper in a food processor until parsley and scallion are finely chopped. Transfer to a bowl and stir in scallion greens and tarragon. Chill until ready to use.