Roasting poultry to make a flavorful stock creates a gravy with an extra punch of flavor. Turkey wings and necks are ideal but chicken and Cornish hen work very well, too. Whatever poultry you use, cut it into lots of pieces to create more surface area for browning. I use a lot of Parmigiano Reggiano cheese and I put all the rinds in a container in the freezer. I use one whenever I make stock or broth, as I do for the stock for this gravy. It is not necessary to peel the onions and garlic.
Cut the turkey or other poultry into chunks. Put the cut-up turkey into a heavy roasting pan. Mix with ¼ cup of extra-virgin olive oil. Season generously with garlic powder and salt.
Roast the turkey at 425°F until dark brown, turning often, 1½ to 2 hours.
Meanwhile, in a heavy-bottomed stock pot, large enough to hold all the ingredients, sauté the carrots and celery in ¼ cup of extra-virgin olive oil over high heat.
As the carrots and celery begin to brown, add the onions and garlic.
Continue cooking, adjusting heat to medium if necessary, to create nicely browned vegetables and fond without burning.
When the vegetables are brown, add 1/2 cup of red wine and 1 cup of water to stop the cooking and set the pot aside until the turkey is ready.
When the turkey is brown, add it and any pan drippings to the stockpot with the vegetables.
Using some of the water, deglaze roasting pan and add the liquid to the stockpot. All these brown bits are important for flavor.
Add the bay leaf, rosemary, sage, parsley, whole cloves, Parmigiano Reggiano cheese rind, if using, black pepper, and enough water to cover generously. Bring to a simmer and simmer, partially covered for six hours, stirring occasionally.
Strain and refrigerate the stock. The stock may be made up to three days in advance.
Gravy
Skim the fat from the top of the stock. Heat the fat to cook off any water. Measure ¾ cup of melted fat and reserve. Add butter, if necessary, to make ¾ cup.
Gently boil the skimmed stock to reduce it to about six cups, if necessary.
Meanwhile, in a heavy-bottomed saucepan, gently brown the flour in the fat from the stock.
Add the six cups of hot stock, approximately ¾ cup at a time, stirring well after each addition, to avoid lumps.
After all the stock has been added, bring to a simmer. Add the wine. Season with 1 teaspoon salt and pepper to taste. (The drippings from the turkey can be fairly salty so the gravy should be under-salted until the final adjustment of seasoning.)
Simmer gently till thick, approximately 2 hours, stirring frequently. Set aside, covered, until the turkey is ready.
After removing the turkey from the oven, deglaze the roasting pan with water. Skim the fat from the deglazing liquid. Pour the defatted drippings into gravy and simmer briefly to achieve the desired consistency. Adjust seasoning.