Wash the toor dal and change water. Take it in a pressure cooker along with turmeric powder. Pressure cook for 3 whistles. Let the pressure fall down.
Wash and chop the drumstick. Chop into 2" pieces. Add this to the dal, add more water as required. Cover with lid and let it cook. Switch off before the first whistle goes off.
Let it stand for the drumstick to get cooked this way.
I normally cook drumstick separetly in MW. However, since I was racing against time, I had to quick turn to cook this in pressure cooker.