Video: Horsemeat may have been in British burgers 'for a year' Mrs Brown told members of the Environment, Food and Rural Affairs Select Committee that a "filler product" found in contaminated burgers sold in supermarkets came from Poland. She confirmed that the meat was a mixture of beef and horse offcuts and said that the supplier had been used for a year. One of the things the Polish authorities are investigating is does that mean that this filler is likely to have been coming in with this kind of problem for a year, or has something changed at the Polish end? Mrs Brown told MPs that the FSA had not identified horse meat as a risk in the past, which is why it was not tested for, but said that they hoped investigations in Ireland and Poland would get to the bottom of the situation.