Take a cow. Chop it into pieces. Sell the edible bits to supermarkets, ship its hide to a handbag factory, send leftover bones and organs to a rendering plant. Now, what's left? In most of the developed world, the answer is simple: pet food. The sinew, gristle and fat regarded as unfit for human consumption are taken away by Mr Pedigree Chum and turned into something the salmonella-resistant stomach of your average Labrador will find vaguely digestible.
But in America, they do food differently. Here, in the land of GM corn, 26 per cent obesity and a government which classifies pizza as a "vegetable", scientists have discovered a way to turn bacteria-ridden scraps from the abattoir floor into a substance called "pink slime", which is then sold to unwitting consumers of hamburgers, tacos and other beef-based junk products. The process involves sticking bovine off-cuts in a heated centrifuge, so they separate into a mixture of liquid fat and a putty-coloured paste. That substance is then treated with ammonium hydroxide (a chemical used in household cleaners and home-made bombs) to kill off salmonella and e-coli. Then it's mixed with regular beef and – hey presto! – you have "all natural" mince.
Read more here Nutrition: That's not ice cream... it's 'pink slime'