Open the jar of salad potatoes, empty into a large bowl. Dump any water off into the sink. Cover with fresh water from tap, and wash any starch residue off.
Let drain well through a sieve for a few minutes.
Meanwhile, mix all the ingredients from the egg down to and including the dill seed. Adjust taste.
Mix the potatoes and dressing together. Chill for 2 hours, more is even better.
Serve sprinkled with the bacon bits, if using, or, a third hard-cooked, chopped egg that you set aside, or both.