Could you recount the incident involving the Yogi who visited Sai Baba with Nanasaheb Chandorkar as described in Chapter 23?

Certainly. Chapter 23 narrates an incident where a practitioner of Yoga, who had thoroughly studied the Yoga Shastras but could not achieve Samadhi, came for Sai Baba's darshan accompanied by Nanasaheb Chandorkar. He held the intent that the "King of Yogis," Sai Maharaj, would resolve his doubts. Upon seeing Baba eating bread with onions, the Yogi's faith was shaken, and he thought, "How can this man remove my doubts?" As the story in Chapter 23 goes, the omniscient Sai Baba immediately addressed this unspoken doubt by remarking, "Nana, only those whose digestion is strong should eat onion." Hearing this, the Yogi was startled into realizing Baba's inner knowledge. He then surrendered with true devotion, listened to Baba's words with a clear heart, and returned happily with his doubts resolved, having received Udi and a blessing.