Eggplant Curry

Ingredients: Eggplant - 1 big s or 7-8 small size Onion - 1 large Tomato -1 medium  Green Chilies - 2 Ginger-Garlic paste - 1/2 tsp [optional] Sambar Powder - 1 tsp [or red chili powder] Turmeric Powder - 1/4 tsp Corn Flour - 1/2 tsp [optional, I didn'..