Blackened Red Onions

spoiled fermented onions


I attempted fermented red onions for the first time. The top half of them smelled, appear, and tasted great. The bottom half had pieces of red onion that had turned completely black. Very different smell. It was an off putting sour smell. Definitely not the same pleasant smell that was coming from the top portion of the jar. As I got closer to the bottom there was more black pieces and the smell was worse and stronger. Any ideas?


Hi there,

Nice to hear from you.

Somehow some oxygen must have gotten into the bottom of the ferment as it is unusual to see this happen from the bottom and not the top. I can’t say how that happened but it definitely sounds like you got spoilage due to oxygen. I trust you tossed it.