Soak the dried bread roll in milk until softened, then squeeze out any excess liquid.
In a bowl, combine the ground beef, soaked bread roll, finely chopped onion, egg, salt, pepper, and ground allspice. Form into medium-sized meatballs.
Bring a large pot of water to a boil and add a pinch of salt. Cook the meatballs in the simmering water for 15-20 minutes, then remove and keep warm.
In a saucepan, melt the butter, add the flour, and cook until lightly golden, creating a roux. Gradually whisk in the vegetable broth, ensuring a smooth sauce.
Stir in the sour cream, capers, and lemon juice. Season with salt and pepper to taste, then simmer for 5 minutes to allow the flavors to meld.
Return the meatballs to the sauce and cook for a few more minutes, until heated through.
Serve the meatballs with caper sauce, garnish with fresh parsley, and accompany with boiled potatoes or steamed rice.
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