Sea-salt ice cream

Sea-salt ice cream (シーソルトアイス) is a type of ice cream found in Twilight Town and Radiant Garden. It appears throughout the Kingdom Hearts universe, but made its first appearance in Kingdom Hearts II. Kingdom Hearts II is also the only game in which the ice cream features as an attainable key item. The ice cream's flavor mixes both a salty taste and a sweet taste.

An interview with Tetsuya Nomura after Kingdom Hearts II explained that Nomura first tasted sea-salt ice cream at a trip to, a smaller resort of Disney's parks in Japan. He liked the ice cream very much and decided to work with Disney to have it put into Kingdom Hearts II. He also said that the idea to put the dessert into the game came to him when he was thinking about what the kids in Twilight Town do and eat over summer vacation.

Kingdom Hearts Birth by Sleep
Following Terra-Xehanort's defeat and their subsequent ejections from Hollow Bastion, Lea buys two sea-salt ice creams from Scrooge McDuck and gives the other ice cream to Isa.

Blank Points
After Terra-Xehanort is taken in as an apprentice, Ansem the Wise and Ienzo eat sea-salt ice cream together while walking down a hall of the castle in Radiant Garden. Axel, Roxas, and Xion are also seen eating sea-salt ice cream together in Twilight Town as they had during their days in the Organization. Roxas and Xion then say Sora's name in unison.

Kingdom Hearts II
Hayner, Pence, and Olette also enjoy this ice cream, usually eating it together. In one of Roxas's memories, Axel offers him a stick of sea-salt ice cream before their parting. After Riku steals the digital Olette's Munny Pouch from Roxas, he asks DiZ what to do with it, and DiZ jokes that they could use it to buy ice cream.

When Sora arrives in Hollow Bastion, he sees Scrooge McDuck, who is trying to recreate the recipe for sea-salt ice cream. Through subsequent visits, Scrooge comes closer to reinventing the flavor and ultimately succeeds.

Riku left a sea-salt ice cream with a picture of Roxas and the gang from the Simulated Twilight Town as clues for Sora, Donald, and Goofy. Donald took an immediate liking to the ice-cream, and ate it.

Ansem the Wise was very fond of this ice cream, and often ate it while conversing with King Mickey, and later used it as the password for his computer in the Old Mansion, which Sora, Donald, Goofy, and Mickey use to enter the Simulated Twilight Town.

Kingdom Hearts 3D: Dream Drop Distance
Axel and Roxas eat sea-salt ice cream in Lea's dream just before his awakening.