I’ve more than once seen Extension home-ec agents roll their eyes when asked if it’s possible to store sauerkraut in the same jar in which it has fermented, with no heating or chilling. Where do such ideas come from? the agents ask.
From Extension’s mother agency, the U.S. Department of Agriculture, of course! Randal Oulton recently sent me a 1936 USDA press release, intended for radio broadcast, about how USDA researchers had made and stored sauerrüben—fermented shredded turnip—in just this way:
Shredded [and salted] turnips were packed in 2-quart glass jars, which held approximately 4 pounds of turnips each when packed firmly. Because of the pressure produced by the gas released during the initial fermentation, the lids of the jars had to be left loose. By this means the gas was allowed to escape, yet at the same time a sufficient concentration of carbon dioxide to prevent aerobic spoilage was maintained over the fermenting material. As the evolution of the gas lifted considerable quantities of the juice to the top of the jar, causing it to overflow, the jars were placed in enameled pans until the period of gas formation was over. Once each 24 hours the lids were removed, the shreds were pushed down into the jars by means of a wooden spoon or blunt wooden stick, the lost juice was returned to the jars, and the lids were replaced.
I wonder if the researchers strained out the fruit flies before returning the juice to the jars. Anyway, the report continues:
As soon as the gas ceased to be given off, which required about 4 days, the jars were sealed tight and stored at room temperature. The fermentation was generally completed in 12 to 14 days, and the product was then ready for use. The product put up in this manner has been kept for 3 years and is still in excellent condition, although heat has not been applied.
Presumably the jars were stored in a cool place such as a cellar and not in a really cold place like a refrigerator. We aren’t told what kind of lids the researchers used and whether the lids formed a vacuum seal. In any case, the method worked, and the writer suggests trying it with 1-quart as well as 2-quart jars. The article makes no mention of exploding jars, which the home-ec agents always warn about.
I would certainly prefer to try this method over another recommended in the same piece: After fermenting the shredded turnip in open stone jars, you cover the surface with mineral oil.
Have you tried making and storing sauerkraut or sauerrüben in small jars without heating or chilling? How well did your method work? I’d love to hear your stories.