Heat the oil in a deep pan. Add cumin seeds and pinch of hing, then add ginger, garlic, green chilies, bay leaf, curry leaves and saut for few seconds.
Add chopped onion and stir fry for 2 mins on medium flame.
Add chopped tomato, mix it and cover it for a minute, remove the lid and stir it again.
Add coriander powder, cumin powder, garam masala, red chili powder, turmeric powder and 1-2 tbsp chopped coriander leaves.
Mix it very well and saut it for a minute.
Now add salt, sugar and mix it well. Cover it again for 2-3 minutes on medium flame.
Shaak is ready, switch the flame, remove the lid, now add sev and chopped coriander leaves, mix well and serve it immediately with roti or paratha.