Have you got a recipe for that?
Well, kind of…
First time I made it I improvised with what I had in the fridge, and liked the results, so I’ve subsequently tried to refine it into a recipe by measuring the quantities. Latest batch was:
250g fresh root ginger, peeled and finely chopped/grated - I’ve been upping the ginger quantity each time, this is *very* gingery
1 large lemon, zest and juice thereof
Put the ginger and lemon zest in a pan with 800ml cold water, put lid on pan, bring to boil then simmer gently for 25 minutes. Take off heat and leave to cool, which will take an hour or so (keep the lid on the pan throughout to prevent losing too much to evaporation). When it’s cool, stir in the lemon juice. Then strain into a bottle - I have some 750ml flip-top bottles and this makes enough to fill one bottle. Keep it in the fridge - it doesn’t have a long shelf life, but it might not last long enough for that to be a problem anyway.
I think it’s very much one of those suck it and see recipes - adjust quantities as you see fit. I’ve also tried it with two lemons but felt it was too lemony for my liking. YMMV. Serve diluted to taste (just don’t drink it neat unless you want to burn your throat). I don’t make it with sugar in deference to my wife but if you want a bit of sweetness, dilute it with apple juice (the cheap shit made from concentrate is fine for this) - a mix of apple juice and fizzy water, plus a squeeze of lime juice, is my favourite combo.
I was also thinking of trying it with mint - maybe throw in a bunch of mint leaves to steep when you take it off the heat. The possibilities are endless!