Can you tell me the story of Boss Dharamsee and the grapes he got from Sai Baba?

Certainly. In a story from Chapter 35, a man named Boss Dharamsee was visiting Shirdi out of curiosity. Sai Baba was distributing grapes, but Dharamsee disliked this particular kind because they had seeds. He was also hesitant because his doctor told him not to eat unwashed fruit. He internally questioned Baba's sainthood for giving him something he didn't like. In response, Baba gave him more. When Dharamsee finally ate the second batch at Baba's command, he was astonished to find they were perfectly seedless. This miracle caused his ego to vanish and transformed his skepticism into deep love and devotion for Sai.