A Rusty on Rye is a sandwich product that only appears in the episode "Séance Schméance." This was created by Rusty Rickets who is known for making them.
It is made by placing two squares of plywood (for the rye bread), a glue-like product, and a grease-like product. It was served at Rusty's Rib Eye, and was not served for a long time, until SpongeBob summoned Rusty Rickets from the dead (since otherwise no one could serve it). The item was number 9 on the Rusty's Rib Eye menu. It is dipped in Shellac and has Spackle in the middle. It is unknown how it is edible, as it would be dangerous for any creature to eat it (However, Old Man Jenkins was able to eat such food.)