Wash and soak dry peas for about 5-6 hours in warm water or overnight.
Once soaked enough, add them into the pressure cooker. Peel and cube the potato and add it with the dry peas.
Add turmeric powder, asafetida (hing), green chilies, and salt, and pressure cook for 3-4 whistles. Once cooked, mash it a little bit with a potato masher and keep it aside.
In a deep pan, heat oil, add cumin seeds, hing, ginger, green chilies, cumin-coriander powder, fennel powder, turmeric, and chili powder, and roast for a minute on low flame. Then add 1 cup of water, rock salt, and let it boil.
Now, add the cooked peas and potato mixture to the boiling water, mix well, add more water if required, and let the curry boil. Then, cook it on low flame for about 5 minutes.
Next, add green chutney, tamarind water, and chopped coriander, and mix it well. Keep it aside.
Garnish and Serve
Now, break and make a hole on the top part of the puris gently with your thumb, and arrange them over a serving plate.
Pour a spoonful of hot ragda into each puri, add all three chutneys as per your taste, then top them with chopped onion, tomato, raw mango, and coriander leaves over the chutney.
Finally, top them with some sev, pomegranate arils, and sprinkle chaat masala, chili powder, rock salt over the stuffed puris, and serve immediately. Enjoy!