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The familiar kidney-shaped cashew you enjoy is actually a seed, not a true botanical nut, and its journey from tree to snack is remarkably unconventional. Instead of growing neatly inside a fruit (Review), this valuable kernel develops within a hard, grey, shell-encased drupe that dangles precariously at the bottom of a vibrant, often red or yellow, pear-shaped structure. This fleshy, aromatic part is known as the cashew apple, a "false fruit" or "accessory fruit" that forms from the stem of the cashew flower, while the actual seed-bearing drupe is the true fruit of the plant.
Originating in the tropical regions of northeastern Brazil, the cashew tree, Anacardium occidentale, was spread across the globe by Portuguese explorers in the 16th century, finding new homes in Africa and Asia, particularly India. However, harvesting these seeds is not as simple as picking them. The raw cashew drupe contains a caustic resin in its shell, rich in urushiol and anacardic acid, compounds chemically related to the irritants found in poison ivy. This toxic (Review) substance necessitates careful processing, usually involving steaming or roasting, to neutralize the irritants and make the delicious kernels safe for consumption.
While the cashew nut has become a globally prized commodity, the often-discarded cashew apple is also edible and highly nutritious. This juicy "apple" is a significant source of vitamin C and is enjoyed fresh, juiced, or fermented into beverages in many cashew-growing regions. The unique growth, intricate processing, and dual treasures of the cashew tree truly make it a fascinating plant with a rich history and diverse uses.