Can you describe the miracle of the grapes that happened with Boss Dharamsee?

Certainly. Chapter 35 recounts the story of Boss Dharamsee, who visited Shirdi with a skeptical mind. A devotee named Kaka had brought grapes with seeds as an offering to Sai Baba. Baba began distributing these grapes, and Dharamsee, who disliked this variety, was internally conflicted. He even questioned Baba's omniscience for offering him something he disliked. As this thought arose, Baba gave him even more grapes. Troubled, Dharamsee held them in his fist until Baba commanded, "Throw them in and eat." Upon obeying, Dharamsee was greatly surprised to find that the grapes in his mouth were completely seedless. He confirmed with another devotee, Babasaheb Tarkhad, that the grapes he received did indeed have seeds. This miracle demonstrated Baba's power to know a person's innermost thoughts and alter the nature of things, causing Dharamsee's doubt to transform into profound faith.