Matjes fillets in milk infuse a few hours.
Cut onions into rings. Heat butter, sauté onions in it.
Peel potatoes and cut into slices, matjes into pieces. Form potatoes, onions and matie in layers in a gratin dish, sprinkle each potato with pepper, finish with potatoes.
Mix whipped cream with egg and pour over the casserole.
Sprinkle breadcrumbs on top, cover with butter flakes and place casserole in cold oven.
E: middle. T: 200 degrees / 25 to half an hour, 5 to 10 min 0.
Sprinkle with chive rolls.
Serving: Beetroot leaf salad.
Tip: As an alternative to fresh chives, you can also use the freeze-dried.