Chicken Stock

how to cook(prepare)Chicken Stock ?
Ingredients

1 small chicken - about 700-800 gm.
1 large onion - skinned and quartered
1 large carrot - peeled and cut in 3 cm. pieces
2 sticks celery - chopped
1 bouquet garni (20 pepper corns, 3 cm. piece cinnamon, 8 cloves, 2 black cardamoms tied loosely in muslin cloth)
2 bay leaves
1/2 tsp. salt
10 cups water
Method
Scald the feet of the chicken in boiling water for 10 minutes.
Drain and place all the ingredients in pressure cooker and cover with salted water.
Bring to pressure, reduce the heat and cook for 15 minutes.
Cool and lift out the chicken.
Remove carcass, wings and neck and put these back into pressure cooker.
Lift off the meat from the bones and add these also.
Place pressure cooker back on fire and bring to pressure.
Reduce heat and cook for 20 minutes.
Cool and strain through muslin.
Remove any fat from the surface by drawing absorbent paper over it.