Grind mustard seeds (2 tbsp) coarsely.
Cut carrots into thin, long strips.
In a jar, mix 5 cups water, ground mustard, spices, and carrots. Stir well.
Cover the jar with a cloth and let it ferment in a warm place for 2-3 days.
Check fermentation for a tangy aroma and slight bubbles. Add lemon juice for extra tang.
Soak dal (½ cup moong and ½ cup urad) for 4-5 hours.
Grind soaked dal into a smooth, thick batter.
Add salt and cumin, and mix well. Let batter rest for 15 minutes.
Heat oil and check if it's ready by dropping a small batter portion.
Fry vadas until golden and crispy. Drain excess oil on a paper towel.
Soak vadas in warm water for 10 minutes to soften.
Press out excess water from vadas.
Add vadas to prepared kanji water, and let soak for 1-2 hours or overnight.
Serve chilled as a refreshing probiotic drink. Enjoy your Kanji Vada, a tangy, flavorful, and gut-friendly drink.