Soak cherupayar (green gram) 3-4 hours in water. Drain the water and boil it with fresh water in a pressure cooker adding salt and turmeric.
Heat oil in a deep saucepan. Add onion, garlic cook it for 1-2 minutes. Add chopped ginger and green chilies. Stir well and add boiled Cherupayar (Green Gram).
Heat 1-2 tsp oil in a saucepan. Add mustard seeds. When its start spluttering add broken red chilies, curry leaves. Stir well and garnish with fresh coriander leaves.
Serve hot with rotis or rice.