Marinate 1 fish head (Katla or Rohu fish head, cut in half) with 1 tsp of turmeric powder (haldi) and 1 tsp of salt (namak).
Make a fine paste of one medium-sized onion, a piece of ginger (half inch size, cut into small pieces), 12 pieces of peeled, whole garlic cloves, 2 pieces of medium-sized tomatoes (sliced roughly), 1 piece cinnamon (1 inch stick), 2 pieces of cloves, 2 whole pods of green cardamom.
Fry the marinated fish heads in 1 tbsp of mustard oil to a nice golden color and keep aside.
Fry the potatoes golden brown.
Fry 1 piece of bay leaf (torn in half), 1 piece of dry red chili (broken in half), ½ tsp of cumin seeds (jeera), ½ cup of Gobindobhog rice for a minute. Add 1 onion cut into four pieces and masala paste.
Add salt, 1 tsp of turmeric powder, ½ tsp of cumin seed powder, ½ tsp of coriander seed powder, ½ tsp of Kashmiri red chili powder, ¼ tsp of sugar and the fried potatoes.
Add 2 cups of warm water. Cover and cook.
Check the doneness, add another cup of warm water and bring it to a boil, and then put in and break the fried fish heads carefully.
Add 1 tsp of ghee or clarified butter, ½ tsp of Shahi garam masala powder and 6 pieces of green chilies.
Your tasty and spicy homemade muri ghonto is ready.