Measure out 1 of the 6 cups of chicken stock and refrigerate so that it is cold.
In a large stock pot, bring the remaining 5 cups of chicken stock to a boil. In a large bowl, combine the cold broth, eggs, semolina, cheese, parsley and nutmeg and whisk until well blended.
Whisk the mixture into the boiling stock and reduce heat to low. Continue to whisk for 3 to 4 minutes. Adjust seasoning with salt and pepper and divide evenly among 6 warmed soup bowls.
Serve immediately, topped with more grated cheese if desired.
In a large, heavy-bottomed saucepan, heat the oil over high heat until smoking.
Add all the chicken parts and brown all over, stirring to avoid burning.
Remove the chicken and reserve.
Add the carrots, onions, and celery to the pot and cook until soft and browned. Return the chicken to the pot and add 3 quarts of water, the tomato paste, peppercorns, and parsley. Stir with a wooden spoon to dislodge the browned chicken and vegetables bits from the bottom of the pan. Bring almost to a boil, then reduce heat and cook at a low simmer until reduced by half, about 2 hours, occasionally skimming excess fat.
Remove from heat, strain, and press on the solids with the bottom of a ladle to extract out all liquids. Stir the stock to facilitate cooling and set aside. Refrigerate stock in small containers for up to a week or freeze for up to a month.
