3 pounds potatoes, red or gold
1/2 cup finely chopped onions, white, sweet, red or green
2 Tablespoons yellow mustard
1/4 cup wine vinegar, red or white
1/2 teaspoon salt-free seasoning, such as Mrs. Dash
1/4 cup chopped fresh parsley
While the potatoes are cooking, mix the dressing ingredients together in a large bowl: onions, mustard, vinegar and salt-free seasoning.
Place the drained potatoes into the bowl with the dressing and toss gently. Allow to cool, toss again and refrigerate until well-chilled. Add the chopped parsley to the cold potato salad.