Why was it considered important to bring an offering like grapes when visiting Sai Baba, and what happened with Kaka's offering?

The practice of bringing an offering is highlighted in Chapter 35, which states, "It is not good to go empty-handed to the door of God, a priest, or a Guru." Following this principle, the devotee Kaka Mahajani bought grapes on his way to Shirdi to offer to Sai Baba. The only variety available had seeds, which he purchased. This offering became the catalyst for a profound teaching and miracle. Baba used these very grapes to interact with a skeptical visitor, Boss Dharamsee. By offering Dharamsee the seeded grapes and then miraculously making them seedless for him, Baba addressed Dharamsee's specific doubts and transformed his heart. This shows that an offering, given with devotion, is not just a gift but can become a tool in the Guru's hands for spiritual work.