Jansson's Temptation

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1. 1Step 1: Preheat the oven to 200°C.
2. 2Step 2: Peel and thinly slice the onions. Sauté in butter on low heat in a frying pan until soft but not brown.
3. 3Step 3: Peel the potatoes and cut them into thin strips.
4. 4Step 4: Brush an ovenproof baking dish with butter.
5. 5Step 5: Start with a layer of potatoes in the bottom of the dish, then add some of the onion and some sprat fillets. Do a few layers like this and finish off with potatoes and sprats on the top.
6. 6Step 6: Pour the cream and the sprat brine over the potatoes. Make sure that the cream doesn't fully cover the potatoes – leave 1–2 centimetres to the top of the dish (or it will boil over).
7. 7Step 7: Bake the casserole in the lower part of the oven for 50–60 minutes, until the potatoes are soft and golden brown.
8. 8Step 8: When 10–15 minutes remain, take the Jansson out and sprinkle it with a thin layer of breadcrumbs.
9. 9Step 9: Put the casserole back in the oven and let the breadcrumbs turn golden. Then, let it rest for a while before serving.