Sweden's beloved potato and anchovy gratin, baked in cream until the edges turn deep golden — a Christmas table classic.
Janssons frestelse — Jansson's Temptation — is a potato casserole built around Swedish sprats (small pickled anchovy-like fish, sold specifically for this dish), layered with thinly julienned potatoes and onion, then drenched in cream and baked until the top turns deep golden and the potatoes soften into the salty, briny cream. It's one of the fixtures of the Swedish julbord, the Christmas smörgåsbord, and also shows up as a late-night snack after a party, valued for how well it survives reheating. The dish depends on using the right fish: Swedish ansjovis (which despite the name is actually cured sprat, not true anchovy) has a sweeter, milder brine than Mediterranean anchovies, and substituting the wrong product changes the dish considerably. Potatoes are cut into thin matchsticks rather than rounds so they cook through evenly and soak up the cream fully, while a layer of breadcrumbs on top crisps under the oven's heat for textural contrast. The origin of the name is genuinely uncertain — some link it to a Swedish opera singer, others to a devout religious sect member who supposedly couldn't resist it — but the dish itself has been a fixture of Swedish home cooking since at least the early 20th century.
Serves 6
Melt 2 tbsp butter in a pan over medium heat, cook onions until soft and golden, about 10 minutes.
Butter a baking dish. Layer a third of the potatoes, then half the onions and sprats. Repeat, finishing with a potato layer on top.
Cut potatoes into thin, even matchsticks — thick pieces won't cook through in the baking time.
Whisk cream, milk, sprat brine and white pepper together and pour evenly over the layered potatoes.
Cover with foil and bake at 200°C (400°F) for 30 minutes.
Remove foil, scatter breadcrumbs and dot with remaining butter. Bake uncovered for 15-20 more minutes until deep golden and bubbling.
Rest 10 minutes, scatter with parsley, and serve hot as a main or Christmas side.
Use real Swedish sprats (ansjovis), not Mediterranean anchovy fillets — they taste noticeably sweeter and less fishy, which is essential to the dish's flavor.
Cut the potatoes into thin matchsticks by hand or with a julienne mandoline for even cooking.
Don't skip the sprat brine in the cream mixture — it carries much of the dish's signature savory depth.
Add a layer of grated cheese under the breadcrumbs for a richer, more indulgent version.
Make individual portions in ramekins for a more elegant holiday presentation.
Reduce the fish for a milder version, though purists consider the full amount essential.
Refrigerate up to 4 days; it's traditionally eaten reheated the next day as a late-night snack after a party. Reheat covered in a 160°C oven until warmed through.
Janssons frestelse first appeared in print in Swedish cookbooks in the early 20th century, with its name origin debated — one popular story credits Swedish opera singer Pelle Janzon, known for his love of good food, though no definitive record confirms this. It became a fixture of the Swedish julbord (Christmas smorgasbord) by the mid-20th century and remains one of the country's most recognizable traditional dishes.
They're small fish cured in a sweet-spiced brine, sold canned specifically labeled for Jansson's Temptation (ansjovis) at Scandinavian grocers or online — regular canned anchovies taste much saltier and more pungent and will change the dish's character.
You can, though it becomes a different, much milder potato gratin — some cooks add extra salt and a small amount of miso or seaweed to approximate the umami depth the sprats provide.
This usually means the potatoes weren't cut thin enough to cook through and release starch into the cream — thin matchsticks are essential, and letting the dish rest 10 minutes after baking also helps it set.
Per serving (300g / 10.6 oz) · 6 servings total
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