A recipe for Pop Overs
"One cup flour, one cup milk, one egg, piece butter size of a walnut, a little salt; to be baked in scallops in a very quick oven. This rule makes twelve."
So much pleases me about this recipe - the extended prose, the measurement of the butter, the ambiguity of 'a quick oven' - but I think the best part is the overwhelming impression that the author expects you to know how to make a cake; this is merely a variation on a theme.
Source: S. S. Pierce in The Home Cook Book, 1877 (Hunter, Rose and Co, Toronto.)