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Beat the curd with half of the red chili powder, salt, turmeric, and also garam masala.
Marinate the pork with it and keep for 6-7 hrs, preferably overnight.
Heat mustard oil in a deep and heavy-bottomed pan.
Temper the oil with a bay leaf.
Also, add the sugar to it and let it caramelize.
Now add the onions, and fry on medium heat until light brown.
Add ginger, garlic, and green chili. Brown it a bit more till the oil separates.
Add the coriander and cumin powder, followed by the rest of the chili powder, turmeric powder, and salt, and fry.
Now add the marinated pork and mix well.
Cook on low flame for 1 hour and 30 minutes or more till the pork is soft and all the water is released. Add a little water once in a while to prevent burning.
Once the pork is soft, open the cover and add ghee and a pinch of garam masala and cover.
Serve Kosha Shuor-er Mangsho with steaming rice or paratha.
To make it more flavorful, store the kosha pork once cooled for 8 hours or so and then cook for 5-6 minutes on a high flame and serve.