Smurf
One of Hector Fenwick's irritating non sequitur questions to the Copper-Colored Cupids involved him asking “why that sorcerer want[ed] to eat the… the blue guys, in that cartoon”, given that, having never successfully caught one before, he had no means of knowing whether they tasted good or not. (PROSE: The Metafictional Meddler)
Behind the scenes
This is evidently an allusion to the 1981-1989 The Smurfs cartoon series. Although the sorcerer Gargamel, the series' main antagonist, was introduced in the original Smurfs comics as wanting to use the Smurfs as an ingredient in a ritual to create a Philosopher's Stone, this was inconsistently simplified in the spin-off cartoons to him simply wanting to eat a Smurf directly, thus introducing the plot hole Fenwick underlines.
