Grind 1 tsp of celery seeds in a mortar and pestle. Keep aside.
Marinate the fish with a little salt. Heat 1 tbsp oil in a pan, shallow fry the fish. Keep aside.
In the same oil, fry the eggplant till golden brown. Keep aside.
To the same pan, add the remaining oil and when smoking hot, add 1/2 tsp radhuni, fenugreek seeds and mustard seeds. Allow the spices to splutter.
Add the raw banana, radish, green papaya, potol and potatoes.
Sprinkle a little salt, add 1/2 tbsp ginger paste, saute for 5-7 minutes. Add 1 cup of warm water, let it simmer till the vegetables become tender.
Now lower the flame, throw in the fried eggplant, gently place the fried fish and pour the milk.
Finish with the freshly ground radhuni and the remaining ginger paste.
Adjust seasonings. Cook over a low flame for a final 4-5 minutes.
Serve with hot rice.