Trim the lady fingers and make a slit on one side without cutting through. Take salt, turmeric powder, garam masala powder, roasted cumin powder, amchur, fennel seeds, red chilli powder and coriander powder in a small bowl and mix. Fill this mixture into the slits. Sprinkle the remaining mixture (if any) over the lady fingers and add a tablespoon of oil. Mix and set aside.
Heat the remaining oil in a kadai, add onion seeds and sauté till fragrant. Add shallots and sauté for one minute. Add gram flour and sauté for a couple of minutes. Add the stuffed lady fingers and mix. Lower the heat, cover and cook, stirring occasionally, till the lady fingers get cooked and turn crisp. Serve hot.