Method -

1. Heat a Pan on medium flame. Once hot add oil.
2. Once the oil is hot add mustard seeds. Once they splutter , add cumin seeds and hing powder.
3. Add Onions and saute till they turn translucent.
4. Add chopped tomatoes and saute till they turn mushy.
5. Add turmeric powder , chilli powder, mix masala , salt to taste. Mix well and saute for another 2-3 minutes.
6. Add the cubed eggplant and potato. Mix well.
7. Add water to adjust consistency. Cover and let it cook till potatoes and eggplants cook.
8. Garnish with finely chopped cilantro and serve hot with roti or rice.