In a large pot, cover the potatoes with an inch of cold water. Bring to a boil, salt the water and cook to tender. Drain and return the potatoes to the hot pot to dry them off.
Meanwhile, place the shallot in a bowl and season with salt, pepper and sugar; cover with cider vinegar and let stand for a few minutes. Add the mustard and whisk in the oil. Adjust the seasonings, to taste. Toss the potatoes with the dressing, celery and dill.
This is one of many “Yum-o!” recipes – it’s good and good for you. To find out more about Yum-o!, Rachael’s nonprofit organization, go to www.yum-o.org.