The appeal of freezing stock flat in bags is that you can store and stash them very easily. Line a coffee mug with a quart-sized zipper-lock bag (this keeps the bag open so both hands will be free for pouring). Fill the bag almost to the top with room temperature stock and seal it. Repeat until all the stock has been placed in bags. Stack the bags flat in a large, shallow roasting pan and freeze. Once the stock is solidly frozen, the bags can be removed from the pan and stored in the freezer wherever there’s room.
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