1: For this recipe, you will need the cooking water left after boiling a Morteau sausage (or other smoked sausage) for an earlier recipe. If you don't have any, use chicken stock instead.
2: Peel and rinse 750 g potatoes and slice, though not too thinly (it's no secret that a mandolin is the best tool for this). Rinse again, dry and put in a large saucepan with salt and pepper.
3: Add enough smoky cooking water to cover and boil until barely tender.