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.