Grind all the kurma paste ingredients with ½ cup water into a smooth, thick paste. Set aside.
Heat oil in a kadhai. Add mustard seeds; when they pop, add urad dal and curry leaves.
Add the onion and sauté 5 minutes until soft. Add ginger-garlic paste and green chillies; cook 1 minute.
Add the tomato, turmeric, coriander powder and salt. Cook 5 minutes until the tomato softens.
Add the mixed vegetables and 1 cup water. Cover and cook 10–12 minutes until the vegetables are almost tender.
Stir in the ground kurma paste and ½ cup more water. Simmer uncovered on low heat for 8–10 minutes, stirring occasionally, until the gravy thickens and the raw coconut taste disappears.
Check salt, garnish with coriander leaves and serve hot with idli, dosa, appam, chapati or rice.