Prepare the mustard paste by blending the mustard seeds with water. Make a smooth paste.
Next, heat mustard oil in a pressure cooker. Add in fenugreek seeds.
Next, add the sliced onions. Cook for 1 minute.
Add the banana stem next and saute. Cook for 1-2 minutes.
Add in the chicken and saute. Let it cook for 5-6 minutes.
Once the chicken starts changing color, add in the mustard paste. Mix well.
Let the mixture cook for 7-8 minutes and add in the powdered spices. Mix well and cook for 5 minutes.
Next, add the water and mix well.
Add the green chilies and coriander leaves. Mix well.
Close the pressure cooker and cook the chicken for 3-4 whistles.
Garnish with black pepper powder and serve hot.