firstly rinse and then soak ½ cup chana dal in enough water for 2 hours.
then drain all the water and add the soaked chana dal in a grinder jar.
without adding any water grind to a smooth paste. if you want you can grind to a semi coarse paste with some chana dal kept whole. but for this recipe i always grind till smooth. scrape the sides while grinding to get an evenly ground mixture.
if you are not able to grind, then you can add 1 to 2 teaspoons water or more if required.
do not add too much water as then you won't able to shape into vadas and then you will have to fry like pakoras.
finely chop the onion, veggies, green chilies, ginger and coriander leaves. the veggies that i have added are cabbage, carrots, cauliflower, capsicum and french beans.