Place gram flour, salt, red chilli powder in a bowl, add sufficient water and mix well to make a soft dough. Heat sufficient oil in a kadai, drop spoonsful of the dough and deep fry till golden and crisp. Drain on absorbent paper and cool slightly.
Chop onion finely. Place potatoes in a bowl. Heat 2 tbsps oil in a non stick pan, add onion and sauté till soft. Add garlic paste, ginger paste and turmeric powder and sauté. Add this to the potatoes. Chop mint leaves and add. Add salt and mix everything well.
Crush the fried gram flour balls and add to the potatoes. Add 1 tbsp cornflour and mix well. Heat 4 tbsps oil in the non stick pan. Divide the potato mixture into lemon sized portions. Dust your palms with a little cornflour and roll each portion into a ball and press slightly. Shallow-fry these in the pan, turning sides, till golden and crisp on both sides. Drain on absorbent paper and serve hot.