1. Soak tamarind in hot water for 10 minutes and extract paste from it.
2. Wash and cut vegetables into small cubes and keep it aside.
3. Wash Red gram dal and add 3 cups of water, turmeric powder, asafoetida and a drop of oil and keep it in pressure cooker.
4. Boil vegetables in cooker or microwave oven and keep it aside.
5. Meanwhile chopp onions, tomatoes and green chillies, capsicum and keep other required ingredients ready.
6. Grind 2-3 pearl onions along with little curry leaves, grated coconut, cumin seeds and garlic. Keep it aside.
7. Sambar powder I have mentioned how to prepare in Podi varieties.
8. Heat ghee in a pan/kadai, add little asafoetida, splutter mustard seeds, cumin seeds, red chilly, capsicum, curry leaves, black gram dal, fenugreek seeds, green chilly, onions, tomatoes and sprinkle little water and fry for some time.
9. Add little salt, red chilly powder, coriander powder, sambar powder and fry for some time.
10. Now add tamarind paste and allow it to boil for some time.
11. Once the dal is cooked and the fried contents to the dal and mix well.
12. Add vegetables and water if required.
13. Then add the grinded coconut-onion paste to it.
14. Finally add chopped coriander leaves to it. Mix them well.
15. Tasty chayote sambar is ready to be served.
16. It can be served along with white rice, idly, dosa or any item of choice.

This recipe is called Chou Chou/Bangalore Kathirikai sambar in Tamil.

Courtesy: http://tamilveg.blogspot.com/