What was so special about Sai Baba telling Jog to give Cholkar tea with sugar?

The significance of Sai Baba's instruction to give Cholkar tea "well-filled with sugar" lies in its demonstration of His omniscience. As Chapter 15 explains, Baba himself did not drink tea, so his sudden thought of it was highly unusual. This act was specifically for Cholkar's benefit. Cholkar had secretly vowed to abstain from sugar until he could visit Shirdi, a penance he had just completed. By mentioning sugar so pointedly, Baba showed Cholkar that He was aware of the secret vow, the long delay, and the personal sacrifice involved. This miraculous sign was meant to confirm Cholkar's faith and impress the "stamp of devotion" upon him, proving that nothing is hidden from Baba.