Grind coriander, dry coconut, garlic, and ginger into a coarse paste.
Grind the tomato separately into a paste.
Heat oil in a pan and add mustard seeds, cumin seeds, and curry leaves.
Add finely chopped onion and saute until lightly browned.
Add the ground paste and saute for 2 minutes.
Add turmeric powder and mix well.
Add the tomato paste and saute for another 2 minutes.
Add onion-garlic masala and salt, then saute for 1 minute on low heat.
Add the green peas and saute well.
Add hot water as needed to achieve the desired consistency.
Cook on low heat for 15-20 minutes, or until the peas are tender.
Your Vatana Curry is ready to be served.