Heat oil in a wide pan over medium heat. Add mustard seeds, lentils and dry red chillies.
Once the mustard seeds pop up and the lentils turn light brown, add in the chopped onions and green chillies.
Sauté till the onions turn translucent.
Add the cubed or sliced plantain pieces, salt, turmeric powder and ginger garlic paste. Stir well for 2 minutes.
Now, add a few curry leaves and red chilli powder.
Stir fry for 4-5 minutes over medium high heat. Constantly stir to ensure they don’t burn or stick to the pan.
Reduce the heat and fry over medium heat till the banana pieces are well roasted and soft.
Turn off the heat when you get a nice golden brown colour.
Transfer to a serving bowl and serve as a side to hot rice along with sambar, rasam or yoghurt rice.