Hasenpfeffer is a yiddish dish, here is a video familiar to some older generations of someone who wants to eat some Hasenpfeffer
https://youtube.com/watch?v=OdXm-cb2cjQ
Why is it Hasenpfeffer Incorporated in the jump rope rhyme they are singing as they skip down the street?
Probably because at least one of the characters is supposed to be Jewish, can't remember which one, they also sing Schlemiel, Schlamazel - unsure of spelling, which are both Yiddish words, although only Schlemiel is somewhat familiar to the public.
https://en.wikipedia.org/wiki/Hasenpfeffer
Shleimiel and Shlmazal are yiddish, via Hebrew.
https://en.wiktionary.org/wiki/%D7%A9%D7%9C%D7%99%D7%9E%D7%9...
and
https://en.wiktionary.org/wiki/%D7%A9%D7%9C%D7%99%D7%9E%D7%9...
I just thought it was a dish that was popular in yiddish speaking communities based specifically on the song, and stuff like the Freleng cartoons, which obviously no idea if Freleng spoke Yiddish although it seems reasonably likely that he had some familiarity.
Hassenpfeffer sounds like a play on Harnischfegger, a maker of heavy construction equipment in Milwaukee.
Trivia: One of Henry Harnischfeger’s customers was Pabst Brewing Co.
Harnischfeger ran itself into the ground in the 90s. I worked in their headquarters for more than a decade. That building is prime real estate and became an FBI office.
Also see Fritz Freleng's work in 1962's "Shishkabugs": https://youtu.be/SK-cmtYrVuo?si=s4sI84cbb25J9K7F