What was the specific promise Babasaheb Tarkhad made to his son to convince him to go to Shirdi?

To convince his son to travel to Shirdi, Babasaheb Tarkhad made a very specific and solemn promise. The son's condition was that Naivedya, a food offering, must be made to Sai Baba before anyone in the house consumed their food. According to the narrative in Chapter 9, his father, Babasaheb, gave his word, saying, "Go, I will offer Naivedya daily; be certain." He further assured his son that no one would eat before the offering was dedicated to Sai. It was only upon receiving this firm assurance that the son felt at peace and agreed to set out for Shirdi.