How did Sai Baba demonstrate his omniscience to Laxmichand regarding the sweet khaja?

Chapter 28 details a wonderful incident where Sai Baba showed his knowledge of Laxmichand's innermost thoughts. After getting a small taste of khaja, a sweet, Laxmichand mentally craved for more on the following day. On the third day, Baba, knowing this unexpressed desire, specifically instructed a devotee to bring a 'plate full of khaja' as a food offering (naivedya). He then declared it an auspicious day and expressed his own desire to have khaja, ensuring it was distributed to everyone, thus satisfying Laxmichand's secret longing and revealing his all-knowing nature.