Marinate the chicken with ginger garlic paste, chilly powder, turmeric powder and salt for 2 hours.
Heat oil and fry onions. Add the marinated chicken and continue to fry.
When water evaporates, add youghurt and fry for 5-6 minutes.
Now mix tomato paste, slitted green chillies, curry leaves and mustard and kalonji powder in another bowl and then add to the chicken and cook. Add half cup of water if necessary.