What is Baba's traditional ritual?

In Chapter Seven, Amir remembers gathering in the yard to sacrifice a lamb for Eid-e-Qorban, in honor of the prophet Ibrahim's near sacrifice of his son. A mullah makes the meat halal and the tradition is to give one third to family, one third to friends, and one third to the poor. Baba's tradition is to give all the meat to the poor because he says, "The rich are fat enough already."