In a big pot place the beef bone with water over the bone, bring to a boil during 3mn, and then rinse the bone with fresh water. Roast in an oven the ginger cut in half, the shallot, anis star, cloves, cinnamon, cardamom during 5mn and then put in a small fabric bag (like a tea bag). Place the rinsed bone, the beef brisket and the small fabric bag into a big pot. Cover with fresh water (about 2,5L) and simmer for at least 3 hours.