Cook potatoes in boiling water, cook broccoli, cauliflower and carrots until al dente for 2-3 minutes, then briefly rinse in cold water and set aside.
Cut potatoes into small pieces and put them in a large bowl with the vegetables. Pour the mustard-cream dressing (preparation see below) over the salad and fold in carefully. Season with salt and pepper and refrigerate until ready to eat. Excess dressing can be kept refrigerated for up to a week.
Mix all ingredients thoroughly. Season the dressing with spices or herbs as desired. Makes approx. 125 ml of dressing.