Heat oil in a skillet over medium heat. When hot, add cumin and mustard seeds and cook them until cumin seeds change color and get fragrant. A few seconds or a minute depending on how hot the plan and oil are.
Add curry leaves carefully. Add garlic ginger and chili and cook for a minute or until the garlic is golden.
Add the coriander powder and turmeric and mix in. Add potatoes and eggplants and mix in.
Add the tomatoes, salt and water and mix in. Cover and cook for 15 minutes. Stir, reduce heat to medium-low and continue to cook until the eggplants and potatoes are tender to preference. about 15 minutes. Taste and adjust salt and spice and mix in.
Garnish with a good sprinkle of cayenne or garam masala or both, and cilantro and serve.
Video
Notes
Add a cup or more of cooked chickpeas and another chopped tomato to make this into a 1 pot meal. Add a dash of liquid smoke for a bharta(mashed eggplant) flavor profile.Instant Pot: Follow steps 1 and 2 on saute. Add coriander and turmeric and tomatoes and mix in, cook for a minute. Add eggplant, potatoes, 1/4 cup water and salt and cook on manual for 4 to 5 minutes. Release the pressure after 10 mins. Taste and adjust salt and spice.