Sweet potato subji

I want to explore the sweet potato, so bought a few. Lunch today is simple rasam and sweet potato subji. Here is how I made it.

Ingredients
Sweet potato 1 skinned and cubed
Mustard seeds 1/4 tsp
Urad dal 1/4 tsp
Asafoetida 1 pinch
Turmeric powder 1/4 tsp
Chilli-Coriander powder 1/2 tsp (I dry roast red chillies and coriander seeds in 1:1 proportion, grind and keep)
Salt to taste
Oil 1/2 tsp

Method

1. Heat oil in kadai. Once hot, burst mustard, urad dal. 
2. Add the sweet potato chunks, turmeric powder, chilli-coriander powder, salt to taste. Mix well.
3. Sprinkle some water and cook covered.
4. It should soften and feel like potatoes once cooked.
5. Give a good toss.  

Serve hot with rice and some curry of your choice.