Why was the specific instruction for 'tea, well-filled with sugar' so significant for Cholkar? Couldn't it have just been a gesture of hospitality?

The instruction for sugary tea was much more than simple hospitality; it was a precise and powerful miracle tailored for Cholkar. Chapter 15 points out two key facts: first, Baba himself did not drink tea, making the request unusual. Second, and most critically, Cholkar had secretly renounced sugar as a personal penance while he struggled to save money for his trip to Shirdi. Baba's command for tea that was "well-filled with sugar" was a direct, unmistakable sign that He was omniscient. It proved He knew not only about the public vow but also about the delay, the financial reasons for it, and the devotee's secret, personal sacrifice. It was this specificity that, as the text says, served to "confirm" Cholkar's faith.