Storing fresh yeast
Up until recently, I've been storing my surplus fresh yeast in the freezer. This works perfectly well, except the yeast isn't all that great when it is defrosted.
I've been experimenting on keeping it in the fridge - tightly wrapped in foil, which seems to be working well.
Here's my experiment so far:
Seems to me that it's a combination of keeping the yeast at a low temperature and excluding all air.