By adding an egg to the bacon naan roll M&S had claimed the recipe was invented by their own chef Chris Baber in a post to Instagram.
The comments were quickly flooded with loyal patrons of the upmarket Indian chain with some accusing M&S of “colonial exploitation” and copying the recipe without crediting the Indian cafe.
Later the post was edited to say the dish was “inspired by Dishoom”.
In a statement posted to Twitter Dishoom accused the supermarket giants of “peddling” the recipe as their own.
It said: “They say imitation is the sincerest form of flattery, and we were, of course, a little taken aback to have inspired such an esteemed establishment.
“It has since become clear that this recipe is now being used, without any credit, across numerous paid advertising platforms – and for all our flippancy, in honesty, it hurts.
“After a year in which our cafés have been mostly closed, a year when we’ve spent many months (and countless sleepless nights) perfecting our first-ever meal kit to be able to bring this much-loved dish to the doors of patrons nationwide, it hurts all the more.”
They invited patrons to book a table in order to help protect the 950 jobs under threat from the pandemic, adding: “You see, @marksandspencer, this isn’t just a bacon naan roll, this is the Dishoom Bacon Naan Roll, and it means a great deal more to us than you know.”
With cafes closed throughout lockdown, Dishoom had been offering bacon naan meal kits with a donation to Magic Breakfast to help feed the UK’s poorest children.
Each home-delivered kit costs £16 and contains all the ingredients you need to make breakfast for two: smoked streaky bacon from Ramsay of Carluke, Dishoom’s signature tomato-chilli jam, fresh coriander, cream cheese and three naan dough balls.