Heat oil in a pan on a low flame. Add the chopped onions and sauté until translucent and lightly golden brown.
Now, add the ginger-garlic paste & the chopped green chilies.
Add chopped tomatoes & cook until they turn soft and mushy, releasing their juices.
Add turmeric and red chili powder, cumin powder, coriander powder, garam masala & salt.
Mix well the spices with the onion-tomato base.
Add the cooked white peas (Magda) and some water to adjust the consistency. Stir well to blend the flavors.
Let it simmer for 8-10 min, stirring occasionally, until the ragda thickens and the spices are well absorbed.
Garnish it with fresh coriander leaves and keep it warm to assemble the chaat.