Again heat a pan in the oven and put 2 tbsp oil with 1 tbsp butter.
In hand, press the potato ball to make its size according to the pav and put into the pan for fry.
Fry the potato ball well in both side, then put 2 tbsp red chatni in pan.
Stir little and place the pav on it as same as picture.
Fry the both side with the red chatni, it increase the taste of bread.
Now put the potato ball on one pice of bread and cover with another one.
Now make a little fry about 10 seconds and keep out the pav from pan.
Now put sliced onion in every middle of pav.
Put one tbsp red chaitni.
Also put 1 tbsp of coriander chatni.
Now your vada Pav is ready to serve.