Smurfberry

A smurfberry is a round red berry that grows on a bush. It is generally considered the primary source of nutrition for the Smurfs along with sarsaparilla leaves. It is part of a plant that is mostly indigenous to the Smurf forest, though there is a remote island guarded by the Sea Witch that also has smurfberry bushes growing on it. The smurfberry is mostly used in various types of dessert dishes as well as in liquid form as a juice.

EMPATH: The Luckiest Smurf stories
Smurfberries have pretty much existed in the Smurf Forest for centuries, so it has been the common source of food for the Smurfs. The nutrients found in smurfberries have been used by the Psyche Master in the creation of Empath's serving of nutrient paste, due to the particular nutrient requirements that a Smurf's body needs on a daily basis.