The chicken tikka masala, or CTM as it is fondly called, was invented by Ali Ahmed Aslam in Glasgow in the 1970s.
Other curry shops and restaurants in the UK have also staked their claim on its origins.
Some, like Chef Anjum Anand, have traced it to the butter chicken that is believed to have been invented at the Moti Mahal in Delhi in the 1950s.
In 2001, former foreign minister Robin Cook declared CTM "a true British national dish".