Horse meat
Horse meat may be eaten without the knowledge of the consumer, due to accidental or fraudulent introduction of horse meat into human food. A 2003 Food Standards Agency investigation revealed that certain sausages, salami, and similar products such as chorizo and pastrami sometimes contained horse meat without it being listed, although listing is legally required. The 2013 horse meat scandal involved multiple products being recalled from shelves due to unlabelled horse meat in amounts up to 100% of the meat content.