Could you recount the story of Boss Dharamsee and the miracle of the grapes?

Certainly. Chapter 35 details the experience of Boss Dharamsee, who visited Sai Baba with a critical and doubtful mind. Kaka, a devotee, had offered Baba grapes with seeds, which Baba then began distributing. Dharamsee not only disliked this variety but was also concerned because they were unwashed. He internally questioned Baba's abilities. Knowing Dharamsee's thoughts and aversion, Baba specifically gave him more grapes. When Dharamsee, obeying Baba's command, finally put them in his mouth, he was astounded to find they were completely seedless. This powerful, personal miracle shattered his skepticism and replaced it with reverence and love for Sai Baba.