Ingredients2 lbs red new potatoes, peeled and quartered1/2 cup mayonnaise1/3 cup minced fresh dill1 1/2 tbsp vinegar1 tbsp whole grain Dijon mustard1 tbsp sugar1/2 tsp salt (or more to taste)1/4 tsp black pepper (or more to taste)Sprig of fresh dill to garnish (optional)