A warning has been issued for UK households buying avocados at Tesco , M&S , Waitrose, Sainsbury's and Aldi . UK shoppers are being urged to remember how to store the healthy, high-in-fat fruits, because avocados present a unique storage challenge.

BBC Good Food warns: "Their post-harvest ripening nature can leave you with underripe or overripe fruits, both culinary downfalls. However, fret no more! By understanding a few key principles, you can achieve peak avocado freshness and minimise waste."

When avocados are unripe, shoppers must resist the urge to refrigerate. "Store them at room temperature on a well-ventilated counter. Avoid plastic bags. Daily gentle pressure checks will indicate when they’re ready – a slight yield signifies perfect ripeness," experts at the Beeb said.

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