Back in the late 1800s, the Frenchman Auguste Escoffier invented, among countless other culinary masterstrokes, the demi-glace.
The sauce is a rich base for many others. It's made by combining equal parts veal stock and espagnole (one of the Mother Sauces, but that's a story for another time).
The demi-glace works very well with beef - a meat, according to McDonald's, which is a prime component in its patties. Also within the sweetened buns are onions, gherkins, ketchup. They're very popular.
We wonder now what happened in the world of food to mean that invention slipped from graceful skill to sheer, unadulterated smoothie-making.
In the video below, a man has decided to take a mound of basic McDonald's burgers and accompanying fries and blitz them into oblivion.
We wonder what the great Escoffier would've thought of such practices. Now, we're not having a go at McDonald's burgers here - we just wonder quite what possessed somebody to create a squashy brown cup of whizzed up hangover food.
Of course the man drinks it! So yes, prepare to gag. Still, at least it's not as bad as an avocado and kale smoothie.