Sounds like one to make at home: Harrods' £32 (gawp) sambo has fresh sourdough, truffle butter, “gold” mustard mayo, mushrooms, seared wagyu steak from Japan, with beer-braised onions and rocket on the side.

"The second-best mouthful came when the beef, mustard mayo and rocket collided with the beer-braised onions, creating a quartet of contrasting textures and tastes: jammy, peppery, savoury and hot.

"Then the truffle and porcini butter arrived, and a grilled, but chilled, portobello mushroom, and everything slid downhill on a tidal wave of umami."

Tell me this, how do you beer-braise an onion, and how do you make truffle butter?