Wolf gravy

Wolf gravy is a condiment of unknown origin that is used on food, which magically transforms anyone who eats it into a werewolf by the light of the full moon.

Mainstream Smurfs Media
It was used by Radna in the cartoon show episode "Wolf In Peewit's Clothing" to turn his visitor Peewit into a werewolf so that he could capture a few Smurfs for restoring Radna's magical abilities. Peewit was restored to his human form with the help of Sir Johan and the Smurfs when he was given a garlic bud to eat while he was still a werewolf. Greedy Smurf accidentally ate some of the gravy and was changed into a weresmurf until he was given a garlic bud to eat.