How to make aloo baingan ki sabzi at home?

Ingredients
Potatoes.............................................4-5 medium (pealed and cut into pieces)
Eggplant.............................................2-3 medium (cut into pieces)
Green chili..........................................2 (chopped)
Ginger................................................1 tsp (paste)
Garlic.................................................1 tsp (paste)
Garam masala.....................................1/2 tsp
Mustard seeds....................................1 tsp
Red chili powder.................................1 tsp
Turmeric powder.................................1 tsp
Coriander powder...............................1 tsp
Asafoetida...........................................a pinch
Coriander leaves..................................2 tbs (chopped)
Lemon juice.........................................1 tbs
Oil......................................................4 tbs
Salt to taste

Method
1. Heat oil in a cooking pan, add mustard seeds, add asafoetida stir for a min.
2. Add chopped potato, eggplant and green chilies, stir for 4-5 min.
3. Add red chili powder, coriander powder, turmeric powder, ginger garlic paste, salt and garam masala, stir for 2 minutes.
4. Add 1 cup water and lemon juice, mix well and cover the pan, cook on low heat till the vegetables are cook. Stir occasionally.
5. Transfer into a serving bowl garnish with coriander leaves and lemon wedges. Serve hot with chapatti and daal rice.