Pressure cook dal with water and turmeric until completely soft. Mash dal. Keep aside

In a pan, heat oil and roast all spices and coconut as mentioned under sambar masala section until brown. Allow to cool completely. Add sufficient water and grind to form paste. Keep aside

In a separate big pan, heat 2 tbsp oil, fry onions, curry leaves,green chilies. Add tomatoes and fry. Add all veggies, turmeric and roast for 5 minutes until raw smell goes away. Add salt, water, cover and cook for 10 minutes until veggies are tender. Add the ground paste to veggies. Mix well

Add tamarind pulp, dal and jaggery. Mix well. Now simmer and allow to cook for 15 minutes

Now heat ghee and splutter mustard seeds. Add urad dal, jeera,hing, dry red chillies. Once urad dal browns, add curry leaves. Switch off

Add seasoning to sambar. Mix well. Add coriander leaves. Serve hot with rice, dosa, idli Vada etc