Wash all the vegetables thoroughly in running water.
Finely chop the onions.
Peel and coarsely chop the ridge gourd.
Partially peel the drumsticks and cut into 2 ½ inch pieces and keep aside.
Take oil in pan and heat it. Now add onions, green chillies and curry leaves and sauté till the onions become soft.
Now add the chopped ridge gourd and mix well.
Add salt and cook on a medium flame with the lid closed.
This type of cooking brings all the water out of the vegetable and the curry is cooked in the same water till soft.
When the salt is added and you cook the vegetable with the lid closed, the water from the vegetable oozes out and it helps in better cooking of the vegetable.
You need not add a single drop of water for these water rich veggies. Once all the water oozes out, add drum sticks and again cook well with the lid closed till ¾ of the water is gone.
Now add chilli powder and mix well. Cook for 2 more minutes and turn off the flame.