To make tomato garlic sauce, heat oil in a non-stick pan, add garlic and saute till fragrant. Add tomato puree, tomato ketchup, degi mirch powder, black pepper powder, vinegar and mix well. Cook till the mixture gets sauce like consistency. Transfer into a serving bowl.
To make chicken balls, take chicken mince in a mixing bowl, add green chillies, coriander leaves, lemon rind, spring onion, breadcrumbs, egg, chilli flakes, salt and black pepper and mix well.
Divide the chicken mixture into small portions and shape each portion into a ball.
Heat sufficient oil in a kadai, slide in the chicken balls and deep-fry till golden. Drain on absorbent paper.
Arrange these balls on a serving platter and serve hot with the bowl of tomato garlic sauce.