Boil chayote pieces in water until tender. Alternately you can either pressure cook or microwave the pieces until tender.
Grind all the ingredients for the masala paste with water to make a smooth paste.
Heat 1 tsp of oil in a pan, add dal and seeds and when the seeds start spluttering, add curry leaves, boiled chayote and masala paste. Cover and cook on medium-low heat till the flavors mingle. Add water if you it gets too dry.
Season with salt and red chili powder (if needed). Serve with rice.