Legend has it that this Swedish dish tempted a religious fanatic to break his vow to renounce earthly pleasures - hence the name. Whatever, the truth, it’s certainly delicious.
Ingredients
25g (1oz) unsalted butter, plus extra for greasing the dish
Preheat the oven to 190°C/375°F/gas mark 5. Generously butter a gratin dish. Heat the butter in a pan, add the onions, garlic and anchovies and sweat for 8-10 minutes, until tender but not coloured. Layer the potatoes and onion mixture in the gratin dish, adding a grinding of pepper to