While out shopping with Chimney, Sanji is persuaded by her to go to a good cook, whom she calls grandpa. The old man teaches Sanji the reason why his food tastes so good, salt which is produced by the Aqua Laguna.
Sanji is buying groceries in the company of Chimney and Gonbe. For lunch, they lead him to the small floating restaurant of a drunken old man. He is asleep and not easily woken, so Sanji decides to prepare something himself. While he is cooking, the old man wakes up and immediately recognizes Sanji's way of handling the carving knife, for he knew Sanji's mentor, "Red-Leg" Zeff. He insists that Sanji taste some of his cooking. Sanji is amazed by the flavor, but cannot figure out how the old man made it. Intent on discovering the secret, he searches the city for seasonings that might have been used. He gets to eat an onigiri made by the old man and realizes that he uses a special salt. The salt was created by Aqua Laguna. As the storm floods the lower parts of the city, it covers the buildings with sea water. In the following sunny days, particularly tasty residual salt is left on the rooftops that Sanji uses.