Volcanic lava juice

Volcanic lava juice is an edible substance of unknown origin that is used by the Smurfs.

Mainstream Smurfs Media
Its first appearance is in the cartoon show episode "The Gingerbread Smurfs", as Brainy and Clumsy used volcanic lava juice in their attempt to create their own recipe for making gingerbread cookies, since Brainy claims that he likes his gingerbread cookies to be a bit more spicy. However, all that the volcanic lava juice did was create an explosion in the kitchen.

Empath: The Luckiest Smurf stories
Zipper Smurf in the EMPATH: The Luckiest Smurf story series is a primary user of volcanic lava juice, since he likes to eat and drink spicy foods.