How to stop avocado from turning brown?

It is suggested that by placing your unused avocado in a plastic container with a piece of chopped onion that you can keep your Avocado fresh for days. They also said that this process works for guacamole too. Simply sprinkle uncut onion on top of your dip and it works a treat.( this I just now read, not tried)

 I've been using lime to preserve cut avocado and store in the fridge with little salt in an air-tight container.

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