Heat oil in a pan and add mustard seeds, red dry chilli and curry leaves.
When mustard starts to pop and splutter add finely chopped red onion, green chilli and sauté it for 30 seconds.
Now add finely chopped tomato, sweet corn, salt to taste and sauté it for 1-2 mins over medium flame.
Turn off the gas, add lime juice and chopped coriander leaves and mix well. Serve hot and enjoy.