Heat oil in pan and add cumin seeds. When they begin to change colour add sliced onions and sauté.Soak boondi in sufficient water.
Add chopped ginger, garlic and sauté for a minute. Add turmeric powder, coriander powder, cumin powder, red chilli powder and stir. Add grated tomatoes and continue to sauté for a few minutes.
Drain the water from boondi.Cook the masala on high heat. Add salt, garam masala powder, chopped coriander leaves and boondi.
Mix and cook on high heat for a minute.
Garnish with sliced spring onion greens and serve hot.