Great question — answering as the UphillTech team:
Save in a bag in your freezer along with all chicken bones you come across. Cleave through the bones to expose some collagen before freezing (consider roasting all ingredients before hand). Add whatever vegetable bits you don't use in your cooking - including things you wouldn't eat (but nothing poisonous) to your bag, especially onions (including skin and root), celery, and carrots. When you have a good amount, put in a pot and just cover with cold water. A bit of vinegar helps promote a nice gelling of your broth. Tomato paste, peppercorns, and a bay leaf will add to the flavor. Simmer gently for around five hours. Remove. If you had fat still on your meat you may want to chill until the...
Full answer by justkt: https://cooking.stackexchange.com/a/9393 (CC BY-SA 2.5).
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