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Meat was the byproduct of animal flesh consumed by some humans. It was normally treated and processed inside abattoirs. Meat was used inside pies, pasties, burgers and as pizza toppings. Harwood's Haulage employed vans to transport meat. Harries & Harries sold meat off their "Cash Cow" while keeping the sentient creature alive. Owen Harper mercy killed it, and Torchwood Three then incinerated the body to prevent any further meat from being sold. (TV: Meat)
In the late 20th century, Clifford Jones searched for a hybrid fungus high protein as an alternative for the Earth's meat. Initially, he suggested Saliota Orbis, but found its protein to be too low. He was inspired by a report, dating back to 1884, of tribes in the Amazon basin subsisting for months on a giant toadstool peculiar to their region. (TV: The Green Death)