Pound the pork slices thinly, then season with salt and pepper on both sides.
In a large pan or pot, heat the oil and sear the meat on both sides until golden brown. Remove the seared meat and set it aside.
In the same pan, add the chopped onion and sauté until soft and caramelized. If desired, you can add a little sweet paprika.
Return the seared meat to the pan with the onion. Pour in the broth and add the bay leaf and allspice berries.
Bring to a boil, then reduce the heat to a minimum, cover, and simmer over low heat for about 1 hour, or until the meat is completely tender and falls apart.
Once the meat is done, remove it and thicken the sauce with flour mixed in a little cold water. Cook for a few more minutes until the sauce thickens. Return the meat to the sauce to heat through.
Serve hot with traditional sides such as mashed potatoes, kluski, or boiled potatoes. You can sprinkle with fresh chopped parsley.