Can you narrate the story of Cholkar's vow to Sai Baba and its fulfillment?

The story of Cholkar, as detailed in Chapter 15, is a profound example of faith and Sai Baba's omniscience. Cholkar, a man from a poor household, vowed to distribute sugar candy in Baba's name if he passed a crucial examination for his job. After passing, he was delayed in fulfilling the vow due to financial hardship, which the text poetically calls the difficult "threshold-ghat." During this time, Cholkar gave up sugar entirely, even in his tea. When he finally reached Shirdi and fulfilled his vow, Baba astonished him by telling his host, Jog, to serve Cholkar "cups of tea, well-filled with sugar," proving Baba knew the intimate details of his secret vow and penance.