Yep. The original is in the Historical Recipes section in the
medieval German recipes. A discussion of the general redaction is in the
1553 Bratwurst thread. The original calls for a 40/40/20 blend of pork, beef and bacon, respectively, but I also do a 100% pork (no beef or bacon) and an 80/20 pork and bacon version. Here's the ingredient list for a kg meat block. I'm using 29-32mm casing, right now.
1553 Pork and Bacon Bratwurst800.0 g Pork shoulder
200.0 g Smoked Bacon
70.0 g Water
11.2 g Morton's Kosher Salt
2.8 g black pepper
3.0 g cut and sifted marjoram
2.9 g ground sage