DAHI VADA (PERUGU VADA)

INGREDIENTS  :
Urad dal     :2 cups
green chillies  :3
onion             :1 small(optional)
salt                 :as needed
oil                   :to deep fry 
DAHI INGREDIENTS  :
Yoghurt          :3 cups
red chillies      :2
cumin              :1/2 tsp
mustard seeds  :1/4 tsp
hing                  :a pinch
curry leaves      :a few
 oil                     :2 tsp
salt                     :as needed
 DAHI METHOD  :
Take yoghurt in a bowl,add salt and mix well without any lumps in the curd.
Heat oil in a pan,add cumin,mustard seeds,red chillies,curry leaves,hing and add this tadka to the yoghurt and mix well and keep it a side.
VADA METHOD :
Soak urad dal for 3 to 4 hrs and grind it to a fine paste by adding little water.
Heat oil in a deep frying pan.
Add chopped onion,green chillies,salt,cumin seeds to the urad dal batter and mix well.
Place a plastic sheet in your palm and place a little urad dal batter and shape it into vada and drop it slowly into the hot oil and fry it on a medium heat until golden brown color.
Repeat the process for the remaining batter.
Place these vada in the yoghurt and keep a side for 30 min.
Serve vada in a bowl and enjoy your dahi vada.