Preheat the oven to 375 degrees F. In a large mixing bowl, combine the ground beef, ground pork, breadcrumbs, egg, onion, milk, salt, allspice, and black pepper. Mix gently with your hands until just blended.
Shape the mixture into a loaf and place it on a baking sheet lined with parchment. Bake for 45 to 50 minutes until the internal temperature reaches 160 degrees F.
While the meatloaf bakes, bring a large pot of salted water to a boil. Cook the egg noodles according to package directions until tender. Drain and return them to the pot.
Add 2 tablespoons of the butter to the drained noodles and toss until evenly coated. Cover to keep warm.
Place the lingonberry jam in a small saucepan over low heat. Stir in the remaining tablespoon of butter and warm until the jam loosens into a sauce, about 3 minutes.
Slice the meatloaf and serve portions over the buttered noodles. Spoon lingonberry sauce on top and sprinkle with fresh parsley.