Can you recount the story of the Yogabhyasi who visited Sai Baba with Nanasaheb Chandorkar in Chapter 23?

Certainly. According to Chapter 23, a practitioner of Yoga, who had thoroughly studied the Yoga Shastras but could not achieve Samadhi, came to see Sai Baba with Nanasaheb Chandorkar. He hoped the 'King of Yogis' would resolve his doubts. However, upon arriving, he saw Baba eating bread with onions, which caused a strong misgiving to arise in his mind, making him question how such a person could help him. Sai Maharaj, being omniscient, immediately perceived this doubt and remarked, 'Nana, only those whose digestion is strong should eat onion.' Hearing this, the Yogi was startled and surrendered with true devotion. Later, he sat near Baba with a doubt-free heart, had his questions resolved, and returned happily after receiving Udi and a blessing.