First make a masala to fill in puris for this take a bowl add mashed potato , boiled black chana , chopped onion
Add salt , black salt , chat masala, green chili paste , garam masala
Mix well.
Break puris form middle make a hole.
Fill potato masala and assemble in plate
Add chopped tomato, boiled chana and sev on each puri
Serve with sweet chatney.
Enjoy immediately