Update as on August 26, 2011: KC Das, St. Marks Road branch has discontinued the below mentioned "diet" or vegan soan papdis because according to them, they were "not moving". We found out about this when we called up to place an order. You can enjoy some of the soan papdis from Haldiram's which continue to be vegan.
“People are the only animals that drink the milk of the mother of another species. All other animals stop drinking milk altogether after weaning. It is unnatural for a dog to nurse from a mother giraffe; it is just as unnatural for a human being to drink the milk of a cow.” ~Dr. Michael Klaper, M.D., Author of ‘Pregnancy, Children, and the Vegan Diet’~