It is a dark shade of red and light red and white on the inside. It looks like a salami sausage and can be chopped into pieces.
Role in series
When going to Seashell Park to get their minds off karate, SpongeBob and Sandy take the barnacle loaf they packed out of the picnic basket and start slicing the pieces to put in some burgers. However, they are reminded of karate, which they are prohibited to perform by Mr. Krabs, and start chopping as many bits as they can. This, however, only aggravates the situation, as the way they cut is reminiscent of karate.
In the Cine-Manga transcription of "Karate Choppers," it plays the same role it does in the aforementioned episode.
Even though SpongeBob and Sandy are seen making burgers with the barnacle loaf at the beginning of their picnic, the burgers that are made from their karate match are not seen with any barnacle loaf pieces.