Retro green goddess dip

4 anchovy fillets, minced

3 green onions, coarsely chopped

1/4 cup coarsely chopped parsley

2 tbsp finely chopped chives

2 tbsp coarsely chopped tarragon

2 tbsp white-wine vinegar

1/2 cup mayonnaise

1 1/2 tsp lemon zest

2 tbsp lemon juice

3/4 cup Greek yogurt

1/4 tsp granulated sugar

1/4 tsp ground pepper