First of all heat oil in a nonstick pan, when it gets hot add cumin and mustard seeds and cook till they starts slathering.
Now add asafoetida along with onions and cook it till onions become transparent then add ginger garlic paste and cook it for 1 minute.
Now add tomatoes and cook it till tomatoes become soft, now add turmeric powder, kashmiri red chilli powder, salt, coriander and cumin seeds powder and cook all the spices for 30 seconds.
Now add water as per need and let it cook for further few minutes, when gravy starts bubbling add pappadums and cook it for another 1 minute.
Now add curd and mix well then add masala boondi and cook it for 2 minutes at medium heat.
Now turn the heat off and take it out in a plate, garnish it with fried pappadums, masala boondi and coriander leaves and serve with chapattis.
Notes
Add salt with care because pappadums and masala boondi both have already salt. If you like dry curry then add less water or else more.