This summer it seems as though everyone whom I know has come down with Swedish fever. Maybe you have friends suffering from this affliction, too. They clutch dog-eared copies of Stieg Larsson’s “The Girl Who Played with Fire” and sit on the edge of their Ikea-designed seats, watching the film adaptation of Larsson’s “The Girl with the Dragon Tattoo” over and over again. When not hashing over missing Larsson manuscripts or the Kenneth Branagh series “Wallander,” they pound the pavement in search of gravlax and good, strong aquavit. Believe me, I’m not scoffing at their plight. In fact, I’m battling a similar addiction. From ethereal cloudberry preserves and delicately flavored kanelbullar to hearty root vegetables and tangy fish I’m completely hooked on the wholesome cuisine of Sweden. It all started with gravlax. Often confused with smoked salmon, gravlax is raw salmon cured in a mixture of salt, sugar and dill. Similar to its smoked cousin, this Swedish specialty originated from the need to store fish in a time when refrigeration did not exist. In medieval …