Can you tell me the story about the Yogi who visited Sai Baba in Chapter 23?

Certainly. Chapter 23 recounts an incident where a practitioner of Yoga, or a 'Yogabhyasi,' came for Sai Baba's darshan accompanied by Nanasaheb Chandorkar. This Yogi was well-versed in the Yoga Shastras of Patanjali but struggled with his practice, as he was unable to achieve Samadhi (intense meditation) even for a moment. He came with the hope that Baba, whom he considered a 'King of Yogis,' would show him grace and remove his doubts. However, upon arriving at the Masjid, the Yogi was taken aback to see Sai Baba engaged in the very ordinary act of eating bread (bhakar) with onions, which challenged his expectations of what a great Yogi should be doing.