Dahi Vada (Less fat)

Ingredients:
to soak in water for 2 hrs and grind into a smooth paste adding little water(about 3tbsp)
1 cup - urud dal
1/2 cup - yellow mung dal
1 - red chilli(optional)
10 - cashews
Other ingredients:
1 - green chilli, chopped finely
1/2 tsp - ginger, chopped
salt
a pinch - hing
a few curry leaves
a handful - coriander leaves, chopped
1/4 tsp - pepper powder

For Yogurt Sauce:
2 cups - yogurt
salt
a pinch - red chilli powder to sprinkle on top
a pinch - garam masala powder to sprinkle on top
coriander leaves to garnish
Method
Grind the soaked dals with little water to a smooth paste.
Add rest of the ingredients. Heat kuzhipaniyaram pan and put 2-3 drops of oil in each hole.
Using a laddle, pour the batter on each hole.
Drizzle 1 drop of oil on top of the vadas.
Cover with a lid and let it cook on low flame for 2-3 minutes.
Flip over and cook for 2 minutes or until they are done.
Mix all the ingredients listed under "ingredients for yogurt sauce".
Tamper mustard seeds in oil and add it to yogurt sauce.
Poke tiny holes on the vadas using a pin(this step is optional).
Drop them in the yogurt sauce 1 hour before serving.
Note:
You can grind coconut and green chilli together and add it to yogurt sauce for enhanced taste.
As Laavanya did, you can dunk the vadas in hot water, gently squeeze extra water and then put them in yogurt sauce.
Or you can even enjoy just plain vadas with coconut chutney.