Try breaking the seal by running the jar under hot water for up to a minute (tilt jar down so the water can reach the underside of the lid). Giving the lid a few wacks with a butter knife while doing this can also help speed up the process. You can also put the jar upside down in a bowl of hot water (just an inch or so deep to cover the lid edge) and leaving for up to a minute before trying again.

Courtesy of TipNut

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