Transfer to a plate, cover and put in the freezer to firm up for 10 minutes. Mix the breadcrumbs with the sesame seeds and turn the fish burgers in the mixture until well coated.

But crumb and fry them until golden and serve with crispy bacon and aioli and you have a slave for life. Now that restaurants and pubs are opening again, there will be crumbs on every table.

The limited-edition burger, offered on December 21, was one of McDonald’s China’s “members only” promotions – a series of discounts and special offers available every Monday.