How did Sai Baba specifically demonstrate his omniscience to Cholkar upon his arrival in Shirdi?

Sai Baba demonstrated his all-knowing nature in a deeply personal way. According to Chapter 15, after Cholkar had fulfilled his vow, he was a guest at Jog's place. As he was leaving, Baba told Jog to give Cholkar "cups of tea, well-filled with sugar." This instruction stunned Cholkar because he had been secretly abstaining from sugar as a penance during the long delay in fulfilling his vow. The text notes that Baba himself did not drink tea, so this specific command was a clear sign that Baba was aware of Cholkar's secret sacrifice. This experience provided Cholkar with undeniable proof of Baba's omniscience, confirming his faith and bringing tears of joy to his eyes.