I know that, but does it actually feature in the game at all yet or is it something that's to be added.
It isn't in the game yet, no, except on a list in the smelter menu. Unless there's some ultra secret way to find it and the devs decided to keep it out of the patch updates. That seems unlikely.
(To clear up the confusion here; When we rewrote workshops to the new per-module system a number of hidden recipes became exposed, because locking recipes in the new UI isn't currently finished. As a result, certain recipes like Refined Food and Pitchblende that would normally either be rewards or associated with special events are visible all the time. It works in its proper context, you just aren't likely to encounter that right now!)
