Can you narrate the story of how Sai Baba fulfilled a devotee's unspoken desire for a particular sweet?

Certainly. Chapter 28 of the Shri Sai Satcharitra describes an incident with a devotee named Laxmichand. During a pilgrimage, he had a small amount of a sweet called khaja and developed a strong craving for more. This desire remained unexpressed in his mind. A couple of days later, demonstrating his inconceivable knowledge, Sai Baba specifically ordered his devotees to bring him a "plate full of khaja" for the daily food offering. As recounted in Chapter 28, this khaja was then served during the meal, fulfilling Laxmichand's hidden attachment and filling his heart with joy at this miracle.