Use pressure cooker or a pan and add oil in it when it gets hot add mustard.
When it splutters add onion garlic ginger and curry leaves in to it.
When it gets brown add chilly powder turmeric powder and salt.
Add the vegetables one by one in to it.
Then add one cup water or as sufficient for the vegetables to get cooked.
Close the pan or pressure cooker and wait till it gets cooked, if its cooker 4 whistle is needed.
After it gets cooked off the flame and add coriander leaves to it.
Transfer to a serving dish.
It can be taken with chappathi and dosa.