In a small pressor cooker add oil and heat it on medium to high flame. Once oil hot enough, then add mustard seeds, cumin seeds and hing.
Now, add curry leaves, whole dry red chilies, chopped green chili and saut for a few seconds. Add chopped tomatoes and stir fry until soft little bit.
Add chopped baingan and potatoes, then add all the masala (red chili powder, turmeric powder, garam masala and coriander-cumin powder) over it.
Sprinkle salt and sugar and mix it well using spatula. Add ½ cup water, cover the lid and cook it for 7-8 mins or until 2-3 whistle.
Switch of the flame and let it cool down.
Open the lid, mix it well and garnish the curry with chopped coriander leaves and serve hot with roti or paratha and enjoy.