In a cooker add oil and cumin.then add ginger-garlic and Chilli paste.saute well.now add onion and cook for five minutes.then add all spices and mix it.now add tomatoes and mix again.cook it for five minutes again.now add peas, potatoes and needed water to make gravy.stir it.cover it and wait for two whistles.after whistles open lid and add coriander leaves.stir it and serve hot with chapati.