Turn good veggie stock into turkey stock -- drumsticks?
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You could certainly add turkey to your vegetable stock. I would recommend saving the meat for leftovers and adding the bones/carcass to your stock.
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Turkey legs are good and if you have the giblets and neck from your whole turkey; add them too
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Or try turkey wings - they are relatively inexpensive and have lots of collagen, so the stock will have great body.