Ibrahim Dogus, who owns Westminster Kitchen in London, says people have also been leaving negative reviews online in protest.
The message read: "Brexit is bad. Immigrants make Britain great. They also cooked and served your food today."
A photo of a receipt from Westminster Kitchen went viral receipt for its message. Credit: Twitter
According to the Independent, the slogan also appears on receipts at the restaurateur's other two locations in London.
"We have been receiving abuse and threats on social media and via phone calls to our restaurant," he told the newspaper.
"We have been targeted by far right groups who are organised on social media and [it seems like they have been] encouraging each other to attack our business by leaving fake reviews on TripAdvisor, Google Business, and Facebook.
"It has been a horrible few days and our staff feel worried about what's happening."
As a result of the abuse, Dogus said he has been forced to contact the Metropolitan Police in order to ensure the safety of both his staff and his premises, adding: "Our manager, Maliq Konjuhi, said that he is worried that someone will come and physically attack our premises."
However, Dogus has said 'love will win over hate' and that he won't be removing the messages from the restaurants' receipts just yet.
"The message will stay on the bills until 1 February and then we will replace [it] with a different message," he said.
"I believe love will win over hate and those who are trying to disguise their racism as political activism are once again caught out."
But while the restaurant has received abuse, Dogus' actions have also been praised by many.
Dogus, who owns Westminster Kitchen in London, says people have also been leaving negative reviews online in protest. Credit: PA
"Brilliant! Good for the restaurant taking should positive action!" one person tweeted.
"Absolutely brilliant. Needs to be in bold and bigger," another said.
Some also offered up their support, with one writing: "Be cautious and careful and report threats. You have support from all over. We're not all narrow minded in this country."
Someone else said: "Because Westminster Kitchen opposed Brexit and supported their immigrant workers on their receipts they are now getting hate mail and death threats from the far right. Let's make sure @WestKitchSE1 tables are full!"
But others decided to swerve the political chat altogether, and took the opportunity to analyse the finer details of the receipt - with one writing, simply: "Nice one and deep fried Brie sounds delicious."
That it does.
Featured Image Credit: Twitter