Sour cream

Sour cream is a dairy product that is used by both humans and Smurfs.

Empath: The Luckiest Smurf stories
In the EMPATH: The Luckiest Smurf story series, sour cream is made by Gelato Smurf and is used in the preparation of various food items, including dips for snack items such as potato chips. It is also used as a topping for baked potatoes along with chives.