In a large bowl, using your hands, combine ground beef, ground pork, Panko, egg, allspice, nutmeg and cooked onion and parsley; season with salt and pepper, to taste. Start with 1 1/4 tsp of each.
Add 1 tbsp of milk at a time till the mixture binds but isn't watery. If you use panko breadcrumbs, you may need all four tablespoons.
Roll the mixture into 1 inch or so meatballs, You should get at least 40 meatballs.
Combine all the glaze ingredients except the parsley in a large skillet, or heavy dutch oven. Bring the ingredients to a boil over medium low heat. Once the sauce is well combined, taste and adjust seasonings. Increase the heat to medium, bring it to bubbling for a minute, and then add the meatballs, stir to coat, and simmer on medium low for about 10 minutes, till heated through. Serve with skewers and fresh parsley.
If you can't find lingonberry preserves, feel free to use whole berry cranberry jelly. Cook the sauce to a bubbling boil for a minute, remove it from the heat, and then carefully use an immersion blender to break up the berries so that they can cling to meatballs. Return to medium low heat and add the meatballs.
Use a sauce like Heinz for best consistency.