Cut chicken into pieces and marinate with curd and salt and keep aside for an hour. Heat oil and fry finely chopped onion until it becomes golden brown. Then add ginger and garlic paste and fry until the aroma comes out. Then add chili powder and coriander mixed in 4 tbsp water. Stir well until the oil comes out clear. Now add the chicken and sufficient water to make good sauce. Cover and let cook on gentle heat till chicken is done.