I've got some mint growing in pots. The leaves seem quite big now, so i'm
guessing now is a good time to cut them off?

My intention is to chop the leaves and put them in vinegar to make a mint
sauce. I'm guessing that malt vinegar diluted with 50% water should be o.k.,
do you think, or is that too watery ?

Also I'm wondering if its ok to cut all the stalks down or not? I could
just pull the leaves off the stalks (since i'm only using the leaves) and
leave the stalks and then plants might recover some nutrition back from the
stalks? Grateful for any advice on the best way to do it. Thanks.