Can you describe the miracle Sai Baba performed with grapes for a skeptical visitor named Boss Dharamsee?

Certainly. The story from Chapter 35 recounts how a man named Boss Dharamsee visited Shirdi with a skeptical, 'clinical' mindset. A devotee named Kaka had brought grapes with seeds as an offering. Dharamsee, who disliked seeded grapes and was also concerned they were unwashed, mentally questioned Baba's sainthood for offering them to him. In response to this silent challenge, Baba insisted he eat them. When Dharamsee complied, he was astonished to find the grapes were perfectly seedless. This personal miracle, tailored to his specific doubts, completely transformed him. He confirmed with another devotee, Tarkhad, that his grapes still had seeds, which further solidified the profound and personal nature of the experience.