Heat oil and fry cumin seeds, cloves, asafoetida, methi seeds & red chillies.
Grind with coconut.
Cook toor dal with a pinch of turmeric in pressure cooker.
Cook Tomato pieces in water(or add it to dal while cooking it).
When cooked, add ground masala, dal, jaggery, salt and cook for some time.
Add water to make it thin, of rasam consistency.
For seasoning, heat oil and add mustard seeds.
When mustard starts popping, add curry leaves and pour this over rasam.
Garnish with coriander leaves.
Serve hot with rice.