Ingredients:
10 raw, peeled potatoes
2 yellow onions
Approx. 20 anchovy fillets
1/2 cup heavy cream
Plain breadcrumbs
1/2 stick of butter
Preparation:
Peel the potatoes and cut them into strips. Peel and cut the onions into thin slices, sautéing them gently in a little butter without browning. Grease an ovenproof baking dish and cover the bottom with a layer of potatoes, then add half the onions and half the anchovy filets. Another layer of potatoes, then the rest of the onion and sprats. Finish with a layer of potatoes. Pour the cream on until it is almost visible through the potatoes. Place a few pats of butter on top and sprinkle with some breadcrumbs. Bake in the oven 475°F for about an hour.
source: https://sweden.se/culture-traditions/janssons-temptation/