Avozillas, thought to be the world's largest avocados, are grown on just four trees owned by a grower in South Africa. Tesco will be the exclusive U.K. seller of the 3-pound fruits, which clock in at five times the weight of a traditional avocado. "The ripe fruit is an attractive vivid green color -- different from the darker-colored smaller variety -- and its thick skin can actually be used as a serving bowl for guacamole," said Tesco Salad Buyer Emma Bonny.

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