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1
In a medium bowl, combine bread with milk, tossing to coat. Let stand until bread is completely softened and most of the milk has been absorbed, about 10 minutes.
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2
Meanwhile, in a small skillet, melt 2 tablespoons (30g) butter over medium-high heat. Add half of minced onion and cook, stirring, until onion is golden and tender, about 7 minutes.
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3
In a stand mixer fitted with the paddle attachment, or in a food processor, combine ground beef, ground pork, soaked bread and any remaining milk, cooked onion, remaining raw onion, 4 teaspoons salt, eggs, white pepper, and allspice. Starting on low speed and increasing to medium-high, beat mixture until ingredients are thoroughly combined, about 30 seconds to 1 minute.
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4
Line a baking sheet with parchment paper. Dipping your hands in water as needed to prevent meatball mixture from sticking, roll roughly tablespoon-sized portions of meatball mixture into balls slightly smaller than golf-ball size. Transfer to lined baking sheet.
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5
Set a rack over a clean baking sheet and heat oven to 200u00b0F (90u00b0C). Heat about 1/2 inch oil in a wide skillet to 350u00b0F (177u00b0C). Working in batches, lower meatballs into oil and fry, turning until well browned all over, about 2 minutes. Transfer browned meatballs to rack and keep warm in the oven.
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6
In a medium saucepan, melt remaining 3 tablespoons (45g) butter over medium-high heat until foamy. Whisk in flour and cook, whisking, until raw flour smell is gone, about 3 minutes. Whisk in chicken stock, bring to a boil, lower heat to a simmer, and cook until thickened, about 3 minutes. Whisk in soy sauce and cider vinegar. Season with salt and white pepper.
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7
Add meatballs to gravy and stir to coat. Simmer until meatballs are heated through. Serve right away with buttered potatoes and lingonberry jam, or speared with toothpicks as an hors d'oeuvre.
