Can you elaborate on the story of the Yogi who visited Sai Baba with Nanasaheb Chandorkar in Chapter 23?

Certainly. Chapter 23 narrates the visit of a Yoga practitioner (Yogabhyasi) who came to Shirdi with Nanasaheb Chandorkar. This man was well-versed in the Yoga Shastras of Patanjali but was frustrated by his inability to achieve Samadhi. He hoped that the 'King of Yogis', Sai Baba, would grace him and remove his spiritual obstacles. However, upon arriving at the Masjid, he saw Baba eating bhakar (bread) with onions. This mundane sight created a strong doubt in his mind, making him question how such a person could solve his profound spiritual problems. As detailed in Chapter 23, the omniscient Sai Baba immediately perceived this thought and remarked to Nana, "Only those whose digestion is strong should eat onion." This pointed comment startled the Yogi, who realized Baba knew his innermost thoughts. His doubt vanished, and he surrendered with true devotion, later receiving Udi and blessings before leaving with a happy mind.