Duck Stock - cooking recipe

Ingredients

2 duck carcasses (about 4 pounds)
1 tablespoon olive oil
salt
fresh ground black pepper
3 cups chopped onions
1 1/2 cups chopped carrots
1 1/2 cups chopped celery
1 head garlic, split in half
6 bay leaves
1 cup dry red wine
1/4 cup tomato paste
3 quarts water, about
10 sprigs fresh thyme
8 sprigs fresh parsley
1 teaspoon black peppercorns

Preparation

Break and crack the carcass.
In a large stockpot, heat the vegetable oil.
Season the bones with salt and pepper.
Add the bones to the pot and brown for about 10 minutes, stirring often.
Add the onions, carrots, celery, garlic, and bay leaves.
Season the mixture with salt.
Cook until the vegetables are soft, about 5 minutes, stirring often.
Add the wine and tomato paste and stir to mix.
Cook for 5 minutes, stirring occasionally.
Add the water.
Put the thyme, parsley sprigs, and peppercorns in a piece of cheesecloth, tie it together with kitchen twine, and add it to the mixture.
Bring the mixture to a boil.
Skim off any cloudy scum that rises to the surface.
Reduce the heat to medium and simmer, uncovered, for 3 hours.
Strain through a fine-mesh strainer and cool.
Refrigerate overnight and remove any congealed fat from the surface.
The stock can be stored in the freezer for 1 month.