Remove bratwurst from the casing and crumble well in a large bowl
Add the ground pork, kale, egg and bread crumbs and mix well by hand
Form medium sized meatballs, (it makes about 40 meatballs)
Brown in batches with olive until a light crust forms, tossing in the pan so it doesn't overly brown. Once all meatballs have been browned for about five minutes, add them all to the pan and braise in the remaining beer
Wipe out pan and saute onions, celery, carrots and rosemary until softened, for about 3-4 minutes
In a heavy pot, combine one tbsp of olive oil, 1 tbsp of flour, 1 tbsp of mustard, 1/2 tsp of salt, 1/2 tsp pepper, 1/2 tsp of paprika
Add cup of beer and stir for about five minutes over low heat.
Add the milk and the cheese. Stir constantly until smooth, about 5 minutes
Add the veggies and the meatballs and the spaetzle and simmer for 25 to 30 minutes