So although what I was actually tracking down was a recipe for Red Velvet Cake (why did the US go all "sticks of butter" and "all purpose flour" somewhere in their domestic history? - always have to translate the recipes into recognisable weights and mixes!), what I ended up finding - to my disbelief - was a recipe for the Cake I Will Never Make (Not Even For Halloween).
Kitty Litter Cake
I kid you not.
The world of US cuisine holds some amazing surprises.
PS I don't eat Vegemite, so don't even go there!