Thanks for replies and tips everyone, I will be trying the ripening method for the underipe ones
Yes I use a fork to strip the currants from stalks sometimes but also leave them on when making jelly as I have a very large commercial style steamer which does a wonderful job of producing highly concentrated juice from fruit and veg.
I have just drawn off 1300ml of thick juice and made first batch of pure Blackcurrant jelly and the taste is fantastic - very strong and you could even dilute it to make it go further if you wanted to - but thought would leave it alone for this batch.
I mixed a small amount of juice with my red gooseberries (from garden) to make jam last week and that combination was really scrummy. I love gooseberry jam but with the kick of blackcurrant running through it it is really lovely.
Was quite surprised to read through Delia Smiths recipe for Redcurrant Jelly - she leaves all the stalks on and cooks redcurrants - then adds sugar and boils it all up together and then strains it before bottling.
I think that's a bit odd myself as the sugar will make it very sticky and at that stage almost setting so you must lose a lot of the jelly. I prefer to strain it through a jelly bag (if I'm not steaming it) and then back in pan , add sugar and then boil till it sets.
Hey ho...putting my feet up now for a little break as the old back is complaining about the days efforts but very satisfying seeing all those jars of lovely jelly.