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, 1/2tsp 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. Twist a lemon and remove the dal from heat and serve.