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Travelers visiting the north of Sweden two hundred years ago, particularly foreigners with sensitive noses, spoke from time to time of the extraordinary stink that blanketed the countryside. One 18th-century merchant wrote home complaining that on these journeys, it was necessary to abstain from kissing the otherwise attractive local women on account of the smell of sour ?sh that enveloped them. He did not realize the odor was simply a by-product of one of Sweden's oldest culinary traditions: fermented ?sh. The fermented herring is an exotic delicacy presumably only a native Swede (and perhaps only a norrlanning, or northerner) can fully appreciate. Each August, there is a rush to buy the year's harvest of surstromming. The ?sh is sold in ordinary tins - similar to the one you see pictured here - that, by the time they are sold, have become more or less spherical in shape due to the pressure caused by the fermentation of its contents. When opened, the can releases a mighty puff of mercaptane gas, a substance so potent that 0.000,000,000,04 of a gram per liter of air is quite enough to make it fully perceptible even to the underdeveloped human olfactory organ.
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