One Piece Chapter 3, page 16-18: Chapter 3: Enter Zolo: Pirate Hunter

Zolo explains that he doesn't need Luffy's help because he has his own plans and will be freed after surviving the month, as promised by Helmeppo. Luffy is skeptical about surviving a month without food, but Zolo boasts about his superior willpower and tells Luffy to look elsewhere. As Luffy turns to leave, Zolo calls him back, asking him to pick up something from the ground.

Zolo asks Luffy to feed him the dirty, trampled rice ball. Luffy is shocked, pointing out it's mostly dirt, but Zolo fiercely demands to eat every single grain. Zolo chews and swallows the dirty rice ball, coughing violently from the dirt. Despite the pain, Zolo tells Luffy to tell the little girl that he ate it all and that it was delicious. Luffy smiles warmly and laughs.

Luffy, Koby, and the little girl are sitting outside. Luffy tells her that Zolo ate all of her rice balls, making her incredibly happy. Koby wonders if Zolo is truly evil, but the girl strongly defends him, explaining that Zolo saved her from Helmeppo's wild, terrifying pet dogs. Zolo was arrested solely because he struck Helmeppo's dog to protect her. Koby realizes that Zolo is actually a good person who only targets criminals with bounties.