Could you narrate the story from Chapter 23 about the Yogi who visited Shirdi?

Certainly. Chapter 23 tells the story of a Yogi, who was well-versed in the Yoga Shastras of Patanjali but could not achieve Samadhi. Believing that the 'King of Yogis' Sai Baba could help, he came for His darshan accompanied by Nanasaheb Chandorkar. However, upon arriving, he saw Baba eating bread with onions. Seeing this simple, seemingly impure meal, a strong doubt arose in his mind, and he thought, 'How can this man remove my doubts?' As Chapter 23 explains, the omniscient Sai Maharaj immediately perceived this thought and remarked, 'Only those whose digestion is strong should eat onion.' This statement startled the Yogi, who realized Baba knew his innermost thoughts. He surrendered with true devotion, his doubts were resolved, and he returned home with a happy mind after receiving Udi and blessings.