Hi, I made my first batch of starter culture just over a month ago and froze it in ice cube trays. I read that it will only last around a month so I want to know whether to just throw it away or whether I should test it and, if so, how?
I've read in several places that you test it by 'seeing if it thickens your milk' but under what conditions? Presumably the same as when I made it originally, but that seems a lot of work just to test it. Can I just put a cube in a cup of milk and keep it warm for 24 hours and if it thickens it is still okay and I can make another batch from it or is there a correct way?
Any help really appreciated, I'm going to make more cheese at the weekend and don't want to waste it if that's not necessary.