Quote Originally Posted by OakLeaf View Post
At least a third and probably closer to two thirds of the glass jars in which I've frozen liquids have broken from the expansion. Doesn't matter how much headroom I leave, it expands around the middle. Any more I freeze in plastic and transfer for reheating.
Oak, I had this problem too. It helps to put the jar of food in the refrigerator first, then freeze the next day, after it's quite cold. And leave some headspace, of course. I don't think ever broke a jar after I started doing that. A couple of years ago I switched to freezing my stocks in Ziplock bags for convenience, but this thread has me thinking about going back to jars.