How did Sai Baba know about and fulfill Laxmichand's specific craving for khaja?

The story from Chapter 28 illustrates Sai Baba's omniscience. After having khaja once, Laxmichand developed a lingering desire for it. On the third day of his visit, when devotees went to the masjid to ask Baba what food offering (naivedya) He desired, Baba specifically instructed them to bring a plate full of khaja. Later, after the arati, two bowls of khaja were brought, and it was served during the meal. This directly fulfilled Laxmichand's unspoken wish, causing joy to arise in his heart and solidifying his devotion to Baba.