When going to Seashell Park to get their minds off karate, SpongeBob and Sandy took the barnacle loaf they packed out of the picnic basket and started slicing pieces to put in 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 exceptionally reminiscent of karate.
In the Cine-Manga transcription of Karate Choppers, SpongeBob takes the barnacle loaf he and Sandy packed out of the picnic basket and starts slicing pieces to put in burgers.
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.