Cook the mutton with 300 ml water in a pressure cooker for 30 minutes on slow after the whistle, till tender. Set aside.
Heat 1 tbsp mustard oil in a frying pan and add the kohlrabi pieces. Fry them for 5-7 mins till lightly golden. Set aside.
Heat the remaining 1 tbsp mustard oil in a deep pan, kadai or casserole, add the whole spices and let them crackle. Be careful not to burn them.
Add the asafoetida followed by the kohlrabi with stalks and leaves, and mutton with stock, salt and bring to a boil. Lower the flame, cover and simmer for 15 mins till the ganth gobhi is tender.
Pour in the milk, stir in the fennel and ginger and simmer for a further 5 minutes. Serve warm with plain, steamed rice.