1 cup buttermilk 1/4 cup cucumber, peeled and grated 1 Tbsp. Dijon-style mustard 2 Tbsp. green onions, white and green parts, or chives, minced 2 tsp. fresh parsley, minced or 1 tsp. dried parsley 1/4 tsp. dill, dried 1/4 tsp pepper, freshly 1 tsp. lemon juice or vinegar