There’s a variety of burger patty, a “brat burger” (“brat” pronounced to rhyme with “cot,” not “cat”) made from bratwurst sausage meat (which, in the U.S., is typically ground pork meat with seasonings)
Brat burgers are popular in Wisconsin, and can often be found at local restaurants and butcher shops. Johnsonville sells a frozen patty line, “Grillers,” which are bratwurst patties.
I have, for several years now, hoped to be able to meet up with @Qadgop_the_Mercotan for brat burgers up in Wisconsin. 