Can you tell me the story from Chapter 23 about the practitioner of Yoga who visited Baba?

Certainly. Chapter 23 recounts an incident where a practitioner of Yoga (Yogabhyasi), accompanied by Nanasaheb Chandorkar, came for Sai Baba's darshan. This man was well-versed in the Yoga Shastras of Patanjali but struggled to achieve the state of Samadhi (intense meditation), despite his knowledge. He came to Shirdi with the hope that the 'King of Yogis,' Sai Maharaj, would show him grace and resolve his doubts, enabling him to attain Samadhi. However, upon arriving at the Masjid, he was taken aback to see Baba casually eating bread (bhakar) with onions, a simple and worldly act that contrasted with his expectations of a great yogi.