Can you describe the incident involving Boss Dharamsee and the grapes in Shirdi?

Certainly. As recounted in Chapter 35, a man named Boss Dharamsee visited Shirdi with a curious but critical mind. When another devotee, Kaka, offered grapes with seeds to Sai Baba, Baba began distributing them. Dharamsee disliked this variety and was internally conflicted about eating them, especially unwashed. He initially tried to chew them and hide the seeds in his pocket. Sensing his unspoken thoughts and attitude, Baba insisted he eat more. When Dharamsee finally obeyed Baba's command and put the grapes in his mouth, he was astonished to find they were completely seedless. This miracle, as detailed in Chapter 35, completely changed his skeptical attitude into one of reverence.