An investigation has started after it was revealed that £3.500 was spent on takeaway curries for inmates at maximum-security Whitemoor Prison.
The Ministry of Justice (MoJ) said the amount spent on 200 meals for prisoners and staff at the jail, near March, Cambridgeshire, was "not acceptable".
The food was believed to have been ordered for Muslim prisoners following complaints about the prison food.
The MoJ said the prison has a highest proportion of Muslims in a UK jail. The MoJ spokesman said: "Such high costs for food are not acceptable and an investigation is under way.