Heat oil in a Kadhai. Add mustard seeds. Once crackled add onions & ginger. Saute until translucent. Add tomatoes, green chillies. Cook it until tomatoes get tender. Add potatoes (cut in small pieces) boiled peas, carrots & coriander Leaves. Add sambhar Masala, red chilli powder, salt & turmeric powder. Mix all properly. Saute all for 1-2 minutes.