dgharmon writes in with an interesting article about how much (or how little) beef is in a UK burger. "The presence of horsemeat in value beefburgers has caused a furore. But what is usually in the patties? It has been a sobering week for fans of the beefburger. Tesco have used full-page adverts in national newspapers to apologize for selling burgers in the UK that were found to contain 29% horsemeat. Traces of horse DNA were also detected by the Food Standards Agency of Ireland in products sold by Iceland, Lidl, Aldi and Dunnes. But a beefburger rarely contains 100% beef."