Chop the meat and grind with the stock, cayenne, fennel, ginger, coriander, pepper, cardamom powder and 1tsp of garam masala, until the meat is a smooth paste. Add a little yogurt and ghee while grinding. Shape meat paste into small balls.
Heat the remaining ghee and add sugar, cream, salt, the remaining yogurt and garam masala. Pour in the milk, add the koftas, and simmer until the liquid evaporates and the koftas are very tender.