Peel the potatoes, cut them into slices and cook them in salted boiling water for approx. 10 minutes until they are just firm to the bite. Drain and drain well.
Cut the onions into cubes. Heat the clarified butter in a pan, fry the potato slices and the onion cubes vigorously and season with salt. Pour in the wine, add the peppercorns and let everything simmer for about 10 minutes. If the wine is overcooked, add a little more. Pour in the cream, bring to the boil briefly, season with salt and serve immediately. Garnish with peppercorns if necessary.
When it comes to potatoes, it`s best to use a predominantly waxy variety.