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1/4 cup milk
340g minced beef chuck (about 20% fat)
140g minced pork (about 25% fat)
2 tsp salt
1 large egg
1/8 tsp ground white pepper
Pinch ground allspice
Vegetable oil, for frying
1.5 tbsp flour
1 cup chicken stock
1/2 tsp soy sauce
1/4 tsp apple cider vinegar
Chopped flat-leaf parsley, for garnish
Meanwhile, in a small skillet, melt 1 tablespoon butter over medium-high heat.
Add half of the onion and cook, stirring, until onion is golden and tender, about 5-6 minutes.
In a stand mixer fitted with the paddle attachment or in a food processor, combine minced beef, minced pork, bread and any remaining milk, cooked onion, remaining raw onion, salt, egg, 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.
Line a baking sheet with parchment paper.
Dipping your hands in water as needed to prevent meatball mixture from sticking, roll roughly 1-tablespoon-sized portions of meatball mixture into balls slightly smaller than golf-ball size.
Transfer to lined baking sheet.
Set a rack over a clean baking sheet and heat oven to 200°F. Heat about 1/2 inch of oil in a wide skillet to 350°F.
Working in batches, lower meatballs into oil and fry, turning until well browned all over, about 2 minutes. Transfer browned meatballs to the rack and keep warm in the oven.
In a medium saucepan, melt remaining 1.5 tablespoons 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.
Add meatballs to gravy and stir to coat. Simmer until meatballs are heated through.
Serve with buttered mashed potatoes.