Traditional German bratwurst are made up of a finely ground mixture of pork and veal. The fine grind and meat mixture gives the sausages a lighter, almost fluffy texture. Some German recipes will use milk and eggs to enhance that fluffy, light texture.
Recipe from the Curious Cuisiniere
1 ¾ lb boneless pork shoulder, cubed
¼ lb boneless beef shoulder, or veal stew meat, cubed
½ c powdered milk
1 tsp salt
1 tsp nutmeg
½ tsp ground black pepper
½ tsp marjoram
¼ tsp ground mace
¼ tsp ground ginger
1 egg
1/3 c milk
4-5 feet hog casing for fresh sausage, rinsed