Jannsens Frestelsee

Something of a classic in Sweden, this is one of those dishes based on the simplest ingredients - anchovies, potatoes, onions, cream - which everyone should know about because it can be knocked up quickly, using ingredients to hand, and is well nigh foolproof. The quantities given here are for two, because it is such an ideal supper dish. Double the quantities could serve five, because it is surprisingly rich and filling.