A cement mixer was adapted to prepare meat by a kebab shop supplier.
Sukru Ahmet, 60, was jailed for four months after he was caught with a six tonne stash of poultry unfit for human consumption.
Inspectors who raided his business, UK Chicken Doner and Poultry Ltd, also found the cement mixer which had been tweaked to mix meat.
Sevenoaks District Council said the case is 'one of the most serious breaches of food safety laws' it has ever seen. A judge fined the company £30,000 and ordered it to pay £23,760 prosecution costs.
The Council has also been granted a Prohibition Order to prevent Mr Ahmet from the management of any food business in future.