Can you tell me the story of Boss Dharamsee and the grapes in Shirdi?

Certainly. The story of Boss Dharamsee, detailed in Chapter 35, is a powerful example of Sai Baba's methods for inspiring faith. Dharamsee, a skeptic, visited Shirdi with what is described as a "clinical interest." When another devotee, Kaka, offered grapes with seeds, Baba began distributing them. Dharamsee disliked this variety and internally questioned Baba's sainthood for forcing them on him. However, when Baba insisted he eat them, Dharamsee was astonished to find they had become seedless in his mouth. This personal miracle shattered his ego, replaced his clinical scrutiny with love for the saint, and solidified his desire to return to Shirdi.