Can you tell me the story about Boss Dharamsee and the grapes? I heard Sai Baba performed a miracle.

Certainly. According to Chapter 35, a skeptical man named Boss Dharamsee visited Shirdi. When Kaka Mahajani offered grapes to Sai Baba, Baba began distributing them. Dharamsee, who disliked grapes with seeds and was advised not to eat unwashed fruit, received some. He internally questioned Baba's sainthood for giving him something he disliked. In response to his silent doubt, Baba gave him even more. When commanded to eat them, Dharamsee found they had miraculously become seedless. This experience, detailed in Chapter 35, stunned him and transformed his skepticism into deep devotion, making him eager to return to Shirdi.