Not quite the real thing: Coca-Cola's 'secret formula' is out of the bottle - but can the famous flavour be recreated at home?
Shoving a carafe into the soda stream, I jump back as brown, fizzy, sticky liquid spurts over the brim and on to my hands, forming a puddle on the worktop. The surface is already a mess. Vials of fragrant essential oils are scattered around carelessly, while a white mound of pure caffeine sits ominously atop of a set of digital scales. I lick my finger. It tastes like Coke.