Add onion,ginger, green chilli and cardamom. Fry for 3-4 minutes. Add tomatoes and cook for 7-8 minutes, covered. Add curd and cook for 5 minutes. Blend in a mixie till smooth.
Heat remaining ghee, add gravy and other ingredients except milk and paneer.
Boil to get a very thick gravy. Just before serving, heat gravy, add milk and paneer fingers and boil for 3-4 minutes. Garnish with chopped coriander and grated paneer.