Peel the onions, wash it and finely chopped and keep it aside. Do same thing with the tomatoes (wash it and chopped).
Heat oil in a pan/Kadai/wok. Add cumin seeds, after crackling seeds, add chopped green chillies and garlic. Add chopped onions, saute for few minutes till onion becomes transparent.
Add tomatoes and all Indian spices like Salt, turmeric powder, red chilli powder, coriander powder and Mix it well with spices.
Cover the Kadai for few minutes till all ingredients mixing with each other or tomatoes becomes soft. Once tomatoes soft, sprinkle garam masala powder, mix it.
Turn the flame off and your Tamatar-Pyaz ki Sabzi is ready to serve. Garnish with chopped Coriander leaves.
Serve with chapatti, paratha's or any bread.