Mohammed Zaman, 52, used cheaper groundnut mix - which contained peanuts - rather than almond powder as a way of cutting costs.
But he failed to warn customers and Paul Wilson, 38, who suffered from a severe peanut allergy died after eating a takeaway from Zaman's restaurant.
Zaman was convicted of Wilson's manslaughter by gross negligence and six food safety offences at Teesside Crown Court.
A restaurant owner has been jailed for 6 years for the manslaughter of a customer who died from a peanut allergy after eating a curry from his restaurant.
Indian restaurant owner Mohammed Zaman failed to inform customer Paul Wilson that the curry used mixed nut powder.
"I would personally like to thank the local community for their amazing donations of food, toiletries and clothing. "
Owners John and Irene Hays say there is ''light at the end of the tunnel'', after the pandemic forced them to close 650 UK stores.
There has been resistance to calls to dismantle memorials to the explorer.