Janssons Frestelse

Jansson's Temptation is a classic Swedish gratin that has anchored holiday tables since the late 19th century, named apocryphally after an opera singer who could not resist it despite his ascetic vows. Its balance of briny anchovies, sweet onions, and starchy potatoes makes it one of Scandinavia's most beloved comfort dishes.

Serves: 6

Ingredients

• 1 kg (2.2 lb) waxy potatoes, peeled and cut into matchsticks (3 mm / ⅛ inch thick)
• 2 large yellow onions, thinly sliced
• 120 g (4 oz) Swedish ansjovis (spiced sprat fillets) or good anchovies, drained, oil reserved
• 300 ml (1¼ cups) heavy cream
• 150 ml (⅔ cup) whole milk
• 30 g (2 tbsp) unsalted butter, plus extra for the dish
• Freshly ground black pepper
• 30 g (¼ cup) breadcrumbs (optional, for crust)

Instructions

1. Preheat oven to 200 °C (400 °F). Butter a 23 × 33 cm (9 × 13 inch) baking dish generously.
2. Sauté onions in the reserved anchovy oil and half the butter over medium heat for 12–15 minutes until soft and golden but not caramelized.
3. Layer half the potato matchsticks in the dish, followed by all the onions, then all the anchovy fillets. Top with the remaining potatoes.
4. Whisk cream and milk together and pour over the gratin. Dot with remaining butter and scatter breadcrumbs if using. Season with black pepper only — the anchovies provide ample salt.
5. Bake for 45–55 minutes until the top is deep golden and the potatoes are completely tender when pierced with a skewer. If the top browns too quickly, tent loosely with foil.
6. Rest for 10 minutes before serving. The gratin slices cleanly once it has settled.

Cook's Notes: Swedish ansjovis are spiced with allspice and sugar and taste milder than Mediterranean anchovies — seek them at Scandinavian import shops. If substituting regular anchovies, rinse them first and add a pinch of allspice. Leftovers reheat beautifully at 160 °C (320 °F) covered with foil. This dish is traditionally served at julbord (Christmas buffet) alongside pickled herring and meatballs.