This is homemade vegetarian snack made with spicy potatoes and bread. A very popular snack in Mumbai or rather say in Maharashtra state in India. The spicy potato pattice is coated with a special batter and is fried until turns little brown and crispy.
This dish is not for a health concious person, actually it is a distant cousin of veggi-burger. And is tastes yummy.
For general information. Here is the link.
Vada pav recipes by two famous Indian chefs, http://www.tarladalal.com/Vada-Pav-2811r and http://sanjeevkapoor.com/recipe/Vada-Pav-KhaanaKhazana.html