Boil water in a vessel.
Cool water and pour in some glass container.
Add asafoetida, turmeric powder, red chilli powder, yellow mustard, salt, black salt, oil and mix well.
Close the lid of the container and keep in sun for 3 days(stir with clean and dry spoon once a day).
Wash and soak both the dal in water for 2-3 hours.
Drain water and grind. Take out grinded dal in a bowl, add salt and beat to make it fluffy.
Heat oil in kadai. Drop 4 - 5 balls of batter with the help of spoon in the oil and fry till golden brown on a moderate heat. Drain on a kitchen towel. Fry all wadas like this.
Soak vadas in lukewarm water with 1 tsp salt for 15-20 minutes.
Vadas will leave extra oil in the water. Squeeze water after 15 minutes, by pressing them a little between palms.
Put 5-6 vadas in a glass and top it with kanji.
Rest for 30 minutes and then serve.
This refreshing and delicious drink will be liked by all.