One Piece Chapter 46, page 5: The Uninvited Guest

Usopp complains to Sanji, "You haven't even cleared away my plates." Sanji points out, "But you still have mushrooms left! Finish it!" Usopp defends himself, saying, "I left them on purpose because I hate mushrooms. I was poisoned by one when I was a kid." Sanji glares, saying, "Well this one ain't poisoned so eat up, long-nose!" Nami intervenes, saying, "Please don't fight just because of me." Sanji instantly melts, saying, "Anything for you, miss!" while Usopp yells, "Just who the hell's fighting for you!?" Nami then mentions, "By the way, Mr. Cook. The food here's just a tad too expensive for me." Sanji immediately offers, "Then it shall be free of charge to you, miss!" Nami beams, "Thank you so much!" while Usopp is left shocked as Sanji points at him and says, "You're paying though!"