What specific promise did Babasaheb Tarkhad make to his son, and what was the daily ritual he followed to keep that promise?

Babasaheb Tarkhad made a solemn vow to his son to ensure the continuity of their family's devotion to Sai Baba. According to Chapter 9, he explicitly promised, "Without offering Naivedya to Sai, no one should consume food at home. ... Go, I will offer Naivedya daily; be certain." To uphold this, Tarkhad began a new daily routine. After bathing in the early morning, he would pray before Sai's painted image for his service to be accepted. His specific ritual involved offering a piece of sugar candy as Naivedya every single day, a rule he followed meticulously until an unfortunate lapse of memory occurred due to business-related preoccupations.