First, take the boiled mashed potatoes in a big plate.
Add required salt.
Add chopped coriander leaves.
Add turmeric powder.
Add coriander powder. (Dont Mix till tempered)
For tempering: Heat oil in a kadai,
Wait until properly heated and add urad dal.
Wait till it becomes golden brown. Next, add mustard seeds.
Add cumin seeds.
Add chopped green chillies.
Add crushed and chopped garlic.
Add curry leaves.
Mix well for 20 secs or so.
Remove from heat and add the tempering to the potato mix. Mix well.
Make medium sized flat balls and keep aside.
Keep the kadai on the flame and take adequate oil for deep frying.
For preparing Besan batter: Take the besan in a bowl and add required salt.
Add turmeric powder.
Add Coriander powder.
Add Red Chilli powder.
Add Soda Bi carb and mix well adding water gradually.
Make a smooth free flowing thick paste,
Now take the potato ball one at a time, dip it gently with your hand. Make sure that the besan mixture is coated well and put in the kadai for deep frying.
Keep the flame medium, repeat the procedure adding 3-4 vadas for deep frying at a time depending on the size of your kadai. Flip the vadas and let them turn golden brown.
Insert the vada in the pav buns. Enjoy Vada Pav Mumbai Style.