Chopped liver is a sentient jar of chopped liver that only appears in the episode "Growth Spout."
It comes in a jar with a light-blue lid and the actual contents in it are light purple.
Role in episode
The chopped liver is able to talk, just like the biscuit that is lying beside him in Mr. Krabs' cupboard.
Both have apparently gone unnoticed by Mr. Krabs for some time. The chopped liver is mostly used as a gag only, for when the biscuit asks, "What am I, chopped liver?," the chopped liver replies, "No, that's what I am."