Margarine

Margarine is a food condiment similar to butter that is used by both humans and Smurfs.

Empath: The Luckiest Smurf stories
Margarine in the EMPATH: The Luckiest Smurf story series is created by Gelato Smurf and is used mostly for food preparation.

Singapore's universe
In Singapore's universe, it is a butter used for baking.