In a small bowl mix together mayonnaise, sour cream, parsley, Dijon mustard, dill weed, lemon juice, salt, and pepper.
Cover bowl with plastic wrap and refrigerate for at least 3 hours before serving.
Makes approximately 1 cup.
Dill Mustard Sauce Recipe: https://whatscookingamerica.net/sauces_condiments/dillmustardsauce.htm