Fry onions in oil and sauté until golden brown. Now it’s a safer option to cook tomatoes in the oil to fry before adding the spices that is why I am doing that safer method here. First add the tomatoes, then add the spices.

Fry the eggplants and capsicum in oil and put those vegetables in a separate pot.

When the tomato curry is cooked add the eggplants in the curry.