1.Boil, steam or microwave potato until tender, drain.
2.Meanwhile, make sweet dijon dressing. Combine ingredients in a screw-top jar, shake well.
3.Cook bacon in a heated medium frying pan, over medium heat, stirring, 5 minutes or until crisp, drain on paper towel. Cook onion in same pan, stirring, 5 minutes until softened. Add mustard seeds, cook, stirring, 1 minute.
4.Combine potato, bacon, onion mixture, parsley and dressing in a large bowl. Season to taste.
We used red-skinned potatoes in this recipe. Bacon can be fried a few hours ahead, cover, refrigerate.