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Following are suggestions on how to make wonderful poultry gravy every time.
seasonings: salt, pepper, chopped or sliced cooked eggs, cooked giblets, poultry seasoning (use sparingly), chopped parsley
See links for homemade chicken stock
If you are making turkey gravy, add turkey carcass to your homemade stock with 2 cups of water, simmer one hour, uncovered. Discard bones, strain stock, then proceed to make gravy.