To cook the potatoes place the unpeeled potatoes in a large pot of water, add 2 Tablespoons of salt and bring to a boil.
Once the water is boiling, turn the heat down. Simmer the potatoes for about 15 to 20 minutes. Check to make sure the potatoes are done before draining in a colander.
While the potatoes are cooking, make the dressing by whisking together the mayonnaise, buttermilk, mustards and dill.
Cut the potatoes in quarters or in half.
Place the cut potatoes in a large bowl.
While the potatoes are still warm, pour enough dressing over them to moisten.
Add the celery, red onion and more salt and pepper (if desired) to taste.
Gently toss to make sure all ingredients are combined well. Cover and refrigerate. If you have the time, let the salad sit in the frig before serving as the flavors will all blend together.
Serve cold or at room temperature and Enjoy!