Can you recount the story of the Yoga practitioner who came to see Baba in Chapter 23?

Certainly. Chapter 23 tells of a Yoga practitioner (Yogabhyasi) who had deeply studied the Yoga Shastras of Patanjali and other texts. Despite his knowledge, he was frustrated because he could not achieve Samadhi (intense meditation) for even a moment. Believing that "Maharaj Sai is a King of Yogis," he came to the Masjid with Nanasaheb Chandorkar for Baba's darshan. His secret hope was that if Sai Baba showed him grace, his doubts would be cleared and he would finally achieve Samadhi. However, upon arriving and taking darshan, his spiritual expectations were met with a mundane sight: he saw Sai Baba eating bread (bhakar) with onions.