Peel the banana and cut it into small, thin slices. If you are using a very ripe banana, it should be firm but not overly soft.
Heat the vegetable oil in a pan over medium heat.
Add the mustard seeds and cumin seeds. Let them sizzle for a few seconds until they release their aroma.
Add the finely chopped onion and green chilies. Sauté until the onion becomes translucent.
Add the sliced banana to the pan.
Sprinkle the turmeric powder and salt over the banana.
Stir well to combine all the ingredients.
Add the grated coconut to the pan and mix thoroughly with the banana.
Cook for about 5-7 minutes, stirring occasionally, until the banana is cooked through and the flavors are well combined.
Taste and adjust seasoning if necessary.
Garnish with fresh coriander or mint if desired.
Enjoy your meal!