In the cooker add oil.then add cumin seeds and ginger, chilli paste.cook it well.add onion and cook for five minutes at medium flame.now add tomatoes and mix well.cook for two minutes.then add spices and mix well.add chicken pieces and add water.mix well.cover it with lid and wait for two whistles.after that check it.if it is cooked perfectly then add coriander leaves and serve hot.