@iknowimcoming
Just seen this! Don't know if you've used all your rhubarb up now, but if not, DH makes amazing rhubarb gin, and it couldn't be simpler.
400g rhubarb, washed and chopped
1.5 litre gin (cheap gin is perfectly fine)
Pour the gin into a bowl - preferably not plastic or metal - and add the rhubarb. Stir, then cover
Leave for 3-5 days, stirring occasionally.
Then filter back into the gin bottle.
And that's it. No need to add any sugar - if you do, that stops it being gin IMVHO, and makes it more like a liqueur.
As well as working well with tonic, it's also lovely with ginger ale.