Cook the brains with vinegar, turmeric powder, 1/4 cup water and required salt. When the water dries up, remove from fire. Cut the brain into small pieces and keep aside.
Cook the potatoes in a pressure cooker and mash them.
Take a pan and pour ghee and some oil. Heat it and add onion, green chillies, ginger and curry leaves. Saute for sometime in medium heat.
Add chopped tomato and saute.
Stir in brain pieces and mix. Saute for sometime and add pepper powder, garam masala, and required salt.
Add mashed potato and chopped coriander leaves.
Mix gently and roll out into cutlets.
Meanwhile beat the egg with 1 tbsp of water. Stir in maida into the beaten egg and make a paste without crumbs.
Roll each cutlet in this maida batter and cover with bread crumbs.
Take a frying pan and pour sufficient oil for frying. Heat the oil and fry the brain cutlets on both sides until golden in color.
Brain cutlet is ready and serve hot.