1. Peel off the skin and cut raw bananas as shown in the picture and soak in warm water adding little salt and curd.
2. Boil it for some 5 minutes either in pressure cooker or microwave oven.
3. Heat oil in a pan/kadai, splutter mustard, black gram, bengal gram, asafoetida, curry leaves, then onions followed by tomatoes and raw bananas, turmeric, chilly powder, coriander powder and little salt.
4. Fry the vegetables nicely for some 20 minutes.
5. Turn around all the curry so that the ingredients mixes well and the vegetable becomes crispy.
6. Sprinkle little water if necessary.
7. Hot and tasty raw banana is ready to be served.

Note:
Raw banana should not be ripen as it will not be nice to cook.
Bananas must be soaked in water before boiling because it will become dark in colour if kept outside after peeling the skin.

This recipe is called Vazhaikai varuval in Tamil.

Courtesy: http://tamilveg.blogspot.com/