The Sponge Patty is a patty that appears in the episode "The Inside Job."
The Sponge Patty resembles a Krabby Patty except that it has two light pink sponges used for the bread buns. Other ingredients for this inedible food include an aluminium brush for the patty, soap as the special sauce, and mop strings as the lettuce.
Role in the episode
SpongeBob SquarePants accidentally creates the Sponge Patty after Plankton (who was inside of SpongeBob at the time) unplugged his eyes. Plankton's plan is to see how SpongeBob makes a Krabby Patty right before his eyes, but didn't count on SpongeBob being completely blind and unable to make one properly. After SpongeBob constructs the Sponge Patty and hands it to a customer, Plankton re-plugs SpongeBob's eyes and SpongeBob is horrified to see the Spongey Patty he made.