Jellyfish Jelly is a type of jelly that is produced by jellyfish. It first appears in the episode "Jellyfish Jam."
Jellyfish Jelly is in a transparent jar that has an orange splat with the text "JELLY" in purple text on it and has a red lid on top.
Jellyfish Jelly tastes very good, and it proved successful. Not only is it good, but it makes anything it is on taste good as well. It tasted so good Mr. Krabs made a Jelly Patty out of it.
In the episode "Jellyfish Jam," SpongeBob grabs a jellyfish ands pulls on its stingers to extract jelly as if he were milking a cow and then proceeds to sandwich the jam in between two slices of bread and eat said sandwich.
In the episode "Jellyfish Hunter," SpongeBob gave Fred a sample, and it was so good that he broke into a song and he gave a sample to everyone else leading to the success of the new Jelly Patty, until Mr. Krabs went too far and SpongeBob and No Name stopped him. Historically, Jellyfish Jelly had been mass-manufactured in the Jellyfish Jelly Factory, operated by Mr. Krabs in his money-making schemes.