Can you tell me about the miracle of the grapes that happened in Shirdi?

Certainly. Chapter 35 recounts a fascinating incident involving a skeptical visitor named Boss Dharamsee who disliked seeded grapes. When another devotee, Kaka, offered such grapes to Baba, Baba began distributing them. Dharamsee was internally conflicted and even thought, "If he is a saint, how does he not know That I do not like these grapes?" Aware of this, Baba gave him even more. When Baba finally commanded him to eat them, Dharamsee obeyed and was amazed to discover the grapes in his mouth were completely seedless. This miracle is highlighted in Chapter 35, which notes his surprise was amplified when another devotee confirmed his own grapes still had seeds.