Janssons Frestelse (Jansson's Temptation)

This dish has converted more anchovy skeptics than any missionary ever converted souls. The name translates to Jansson's Temptation, allegedly after a 19th century Swedish religious figure so devout he preached abstinence from earthly pleasures. Yet even he couldn't resist this gratin. Whether the story is true matters less than what it tells us: some dishes transcend willpower.

The secret lies in Swedish anchovies, which aren't anchovies at all. They're sprats cured in a sweet, spiced brine that renders them mild, almost candy-like compared to the briny Mediterranean fillets Americans know. Don't substitute. Find the real thing in the Scandinavian section of your grocery store or order online. The small Swedish tins labeled "ansjovis" are what you want. This single ingredient makes or breaks the dish.

I first encountered Janssons Frestelse at a Christmas smörgåsbord in Minnesota, surrounded by Scandinavian descendants who treated it as sacred as their grandmother's china. The gratin arrived bubbling, its surface a patchwork of golden potato edges and cream-darkened valleys. One bite explained everything. The potatoes had absorbed the cream until they were almost custard-like, while the anchovies had melted into savory sweetness throughout. It was comfort food elevated by restraint.

This recipe works beautifully for gatherings because it improves with advance preparation. Assemble it the night before, refrigerate, and bake the next day. The flavors marry. The potatoes soften further. Your Christmas morning becomes infinitely more peaceful.