Mix all the 3 dals. Wash and soak them for 20 mins. Drain the water and add the dal in a deep pan along with 4cups of water, salt, green chilly ginger chopped and turmeric.
Boil the dal till dal is tender and gets mashy. remove and keep aside.
For the tadka heat a pan and add ghee.
Sprinkle asafoetida and dry red chilly. Stir and add cumin, once it crackles add the boiled dal.
Add a dash of water if the dal is very thick. Season with salt and finish with freshly chopped coriander.