"This can only be obtained from an Octorok-type enemy. You can sell it to a store, or you can make elixirs with it, but it may have other uses, as well."
— In-game description

Octorok Eyeballs are items from The Legend of Zelda: Breath of the Wild. Link can cook with it to create food or elixirs. Five of them are required to upgrade the Snow Boots at level 3.