Cook the potatoes in gently boiling water until tender. At the same time, cook the sausages.
Meanwhile make the vinaigrette. Place the vinegar and shallots in a bowl with salt and pepper and whisk in the oil. When the potatoes are cooked, drain, place them in a warm bowl, and break them up slightly with a fork. Toss with the vinaigrette and sprinkle with the parsley.
Serve the s