Preheat the oven to 375 degrees F (190 degrees C).

Chop ham in the bowl of a food processor.

Combine chopped ham, pork, eggs, oatmeal, and milk in a large bowl. Let sit, 3 hours to overnight.

Shape into loaves and place in a large baking dish or loaf pans.

Combine brown sugar, water, vinegar, and mustard for sauce in a bowl. Pour over loaves.

Bake in the preheated oven until no longer pink, 1 1/2 to 2 hours.