Can you recount the story of Cholkar and the vow he made to Sai Baba?

The story of Cholkar, found in Chapter 15, illustrates Baba's omniscience. Cholkar was a poor man whose job security depended on passing an examination. He made a vow to Baba that if he passed, he would distribute sugar candy (khadisakhar) in His name. After passing, financial difficulties, described as the difficult "threshold-ghat," delayed him from fulfilling the vow. As a personal penance, he gave up eating sugar entirely. When he finally made it to Shirdi and fulfilled his vow, Baba confirmed His awareness of the entire situation by asking a host to give Cholkar tea that was "well-filled with sugar," proving to Cholkar that his secret devotion and struggles were known to Baba all along.