First of all heat oil in a non stick pan, in little hot oil fry the cashew nuts till become light pink colour then take them out in a plate and keep aside.
Now in the same oil put cumin and mustard seeds, cook it little then add asafoetida along with onions and cook it till onion become light golden brown.
Now add garlic paste and saute it for few seconds then add tomato and let it cook till tomato become soft.
Now add turmeric powder, kashmiri red chilli powder, hot red chilli powder, salt and 1 cup water and cook it for 2-3 minutes at medium heat.
Now add curd along with cashew nuts and capsicum, cook it for 1 minute, now add gathiya and again cook it for 1 minute.
Now turn the heat off and take out in a serving plate and garnish with coriander leaves and cashew nuts.