Can you recount the story of the Yoga practitioner who came to see Baba in Shirdi?

Certainly. Chapter 23 narrates the story of a practitioner of Yoga (Yogabhyasi) who accompanied Nanasaheb Chandorkar to the Masjid for Baba's darshan. This man had thoroughly studied the Yoga Shastras but was unable to achieve Samadhi (intense meditation) even for a moment. He came with the hope that Sai Baba, whom he considered a 'King of Yogis,' would show him grace, remove his doubts, and help him finally achieve Samadhi. However, upon arriving for this profound spiritual purpose, the first thing he saw was Sai Baba simply eating bread (bhakar) with onions.