Aloo puttu/curry/masala for dosa

Ingredients:
1.)potato-3 boiled and coarsely chopped
2.)green chillies - 4(cut into 1/2 inch pieces)
3.)onion - 1 small(chopped)
4.)mustard seeds - 1tsp
5.)cumin seeds - 1tsp
6.)channa dal - 1 tbsp
7.)ginger garlic paste - 1tsp
8.)curry leaves - 4
9.)oil - 1tbsp
10.)salt -to taste
11.)turmeric powder -

Procedure:
Take oil in a pan. When it is hot, add mustard seeds,cumin seeds and channdal. Once the mustard seeds start spluttering add onions and green chillies