You can cook the duck stock a day earlier if you wish. The recipe is similar to the chicken stock recipe.
You only need 1 cup of duck blood for 5 to 6 cups of duck stock.
You can add more or less vinegar depending on how sour you want the soup.
You can replace the pears with dried plums, prunes, apricots, cherries, raisins, apple slices, or any fruits of your choice.
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