Grind meats. Grind beef and pork together. Grind 3 more times. Onion can be ground in the last grinding.
While grinding meats, soak bread crumbs in 1 1/2 cup milk. Add all seasonings. Stir very well.
Slowly beat and add milk mixture until light. Beat very well. Tastes better if sits for at least 2 hours, also easier to handle.
Heavy Duty Mixer Method:
Combine meats and beat very well.
Meanwhile, soak bread crumbs in milk. Add remaining ingredients to milk mixture and stir well.
Slowly beat ground meat and add milk mixture together until light. Beat very well. Tastes better if sits for 2 to 3 hours, also makes it easier to handle.
Cook:
Form meatballs in an oblong shape and drop into frying pan with a little fat. Brown on all sides, turning carefully, until cooked through. Remove to warmed serving dish.
Make a gravy from the brownings in the pan and pour over meatballs.
Notes
Start with 1 1/2 cup milk. Use anywhere from 1 1/2 to 2 cups milk. Generally will use 1 2/3 or 1 3/4 cup. It is better for mixture to be too thick than too thin.