Recipe Station

As Lifehacker notes, this method really couldn't be any simpler. We wish everything was this easy!

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All you have to do is cut up your onions (slices and rings are more versatile), stick them in a bowl, and pour enough red wine vinegar in the bowl to cover all the onion slices. Wait for 15 minutes and you’re done.

Finished!

We just love it when come across a cooking hack like this that's quick and easy. It really makes the rest of our job so much simpler and we're always on the lookout for tips like this.

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Article Source: Life Hacker