forgot to say, we drink unpasturised milk, so I just mix a few spoons of yummy paris ck yoghurt in there and leave overnight it in an oven thats been turned off. = yoghurt! Amazing to me. Also if you leave it on the bench another day or two and strain it and mix in some salt = cheese. Yummy soft cheese too. This is only raw milk though I think, normal milk I imagine will go off.