Prep the potatoes - Rinse the potatoes and boil them until a fork passes easily through a test potato. Quarter the potatoes and add them to a large bowl.
Cut the scallions - Cut the scallions across, using both greens and whites. Add them to the bowl with the potatoes.
Make the dressing - In a small bowl, combine the mayo, Country Dijon, dill, salt and pepper, and lemon juice. Stir until it's smooth and creamy.
Finish - Fold the dressing into the potatoes and onions and garnish with parsley. Serve and enjoy!