This fermented pepperoncini recipe is adapted from my basic fermented pepper recipe that you can find in our Learn How to Ferment Any Type of Pepper blog. These fermented pepperoncini taste similar to pickled peppers, but with a more deep umami flavor. When you use this recipe, the fermented peppers are so well preserved that they last in the fridge for over two years. They’re quite delicious, so I don’t think you will need to store them that long.