1. In a pressure cooker put dal, chow-chow (chayote), tomato, turmeric, salt and water. close lid and cook for 4-5 whistles. Let it sit for 5 minutes.
2.Heat a deep curved pan, pour oil, add mustard, cumin. when it starts spluttering, add curry leaves, green chilies, garlic and saute for 1 minute then add the cooked dal and vegetable.Give it one boil.
3. Garnish with cilantro and serve with rice or roti.