Roughly chop onions and put into a mixer jar. Add 2-3 green chillies, coriander leaves, yogurt and grind to fine paste.
Place chicken in a bowl, add ground masala and mix well.
Heat oil in a non stick pan, add cumin seeds and when they begin to change colour, add garlic cloves and sauté.Halve the remaining green chillies and add. Add salt and sauté till garlic turns golden.
Add marinated chicken, cumin powder and a little water. Mix well, cover and cook on medium heat till chicken is done. Add chopped garlic, squeeze juice of the lemon and mix well.