Fermenting food is an age old way of preserving foods. The added benefit of fermenting foods it that the fermentation boost all the vitamin values and provides loads of healthy probiotics which are fantastic for gut health. Cheeseslave shares a recipe for fermented salsa and Survival Sherpa has one for fermented sauerkraut.
Everyone should learn how to ferment foods if for no other reason than in case of extended power outage. The health benefits of it though makes it worth the effort.
Get Your Gut In Shape: Down and Dirty Sauerkraut