Gai Sheung Tong - basic chicken stock

Gai Sheung Tongbasic chicken stockIngredients:2000 gr chicken bones2000ml water10 black peppercorns1 onion5 cm jahe1 tsp salt4 sprigs of coriander2 small sprigs of celeryPreparation:Grate the jahe and cut the onion, coriander and celery into pieces. Heat the water in a pan with all the ingredients and bring to a boil. Then simmer on low heat and covered for another 60 minutes. Scoop off the scum first and then strain the broth. Let it cool and then skim off the fat.