Can you recount the story of Boss Dharamsee's visit to Shirdi and the incident with the grapes?

Certainly. In Chapter 35, Boss Dharamsee accompanies other devotees to Shirdi, driven by curiosity but with a skeptical heart. When another devotee, Kaka, offers grapes with seeds to Sai Baba, Baba begins distributing them. Dharamsee dislikes this variety and is also concerned they are unwashed. He internally questions Baba's sainthood for offering him something he dislikes. Knowing his thoughts, Baba gives him even more. Finally, obeying Baba's command to eat, Dharamsee is astonished to find the grapes are completely seedless. This personal miracle dissolves his ego, and he is filled with love for Sai, demonstrating the profound way Baba could transform a person.