Cipollini onions are in season right now. The classic Italian preparation for them calls for a sweet and sour sauce made from tomatoes and vinegar. This recipe shows you how to can cipollini onions in sweet and sour sauce. Just heat to serve.
Julia Child said "It's hard to imagine civilization without onions." I have to agree with her, but I might add a couple words to that sentence. For me, it's hard to imagine civilization without onions and vinegar.