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A new board has been set up by the city council to review standards and practices for buying food for schools, elderly people's homes and other council venues.
It follows the withdrawal of halal lamb burgers supplied to 19 schools by Paragon Quality Foods in April after the council claimed tests showed up to 50 per cent pork in a sample burger.
However, this was disputed by the Doncaster firm which claimed independent tests it commissioned revealed the burger did not contain any pork at all.