What was the significance of Sai Baba asking for tea with extra sugar for Cholkar?

The significance of Sai Baba asking for sugary tea for Cholkar was to provide a deeply personal and undeniable confirmation of His omniscience. As Chapter 15 explains, Cholkar had secretly vowed to give up sugar until he could fulfill his promise to distribute sugar candy in Shirdi. This personal austerity was known only to him. Therefore, when Baba, who did not even drink tea, specifically instructed Mr. Jog to give Cholkar tea that was 'well-filled with sugar,' it was a direct message. It proved to Cholkar that his vow was accepted, his long penance during the delay was seen, and that Baba knew his innermost thoughts, which brought tears of joy to Cholkar's eyes and solidified his faith.