The Wisconsin cannibal sandwich is defined by the step it leaves out. There is no cooking. Fresh raw ground beef is spread on dark rye, seasoned with salt and pepper, and topped with raw sliced or diced onion, and that is the entire preparation. Everything that makes it what it is follows from that absence: it is a sandwich whose quality lives or dies on the beef alone, because there is no heat, no crust, and no sauce to stand between the meat and the eater. In a state with a deep German butchering tradition it reads less as a novelty than as a test of trust in the grind, and it appears mostly around the holidays, on a tray, as something a household either serves or refuses.
The craft is sourcing and seasoning, not technique. The beef has to be very fresh and finely ground, kept cold, and spread in a thin even layer so it stays loose rather than packing into a dense paste on the bread. The rye is structural and deliberate: a firm, sour, seeded loaf gives the soft cold meat a sturdy base and answers its richness with acidity and chew, which a soft white bread could not do. Salt is applied generously because there is no browning to build flavor, and the raw onion is the only sharp, crunchy counter to a uniformly soft and fatty bite. It is assembled and served cold and eaten right away rather than held, which is a food-safety reality as much as a textural one, and public-health authorities warn against it plainly.
It does not branch into a family so much as sit beside its relatives. The same impulse runs through steak tartare and the German Mett spread on a roll, each a codified raw-beef preparation with its own rules. Those deserve their own articles rather than being crowded in here.