Place the dried porcini mushrooms in a small bowl and cover with 1 cup of boiling water; let them soak for 20 minutes until soft, then chop them (reserving the liquid).

In a large heavy-bottomed pot or Dutch oven over medium heat, fry the chopped bacon until the fat renders and it becomes crispy, about 5-7 minutes.

Remove the bacon with a slotted spoon, keeping the fat in the pot, and add the cubed pork shoulder; sear on all sides until browned, about 8-10 minutes.

Add the sliced kielbasa and diced onion to the pot with the pork, sautéing for another 5 minutes until the onions are translucent and fragrant.

Stir in the shredded fresh cabbage and cook for 3-4 minutes until it begins to wilt.

Add the rinsed sauerkraut, cooked bacon, chopped mushrooms (with their soaking liquid), and chopped prunes to the pot, stirring well to combine.

Pour in the red wine and stir in the tomato paste, bay leaves, caraway seeds, marjoram, salt, and pepper.

Bring the mixture to a boil, then reduce the heat to low, cover the pot, and simmer gently for at least 90 minutes, stirring occasionally to prevent sticking.

Remove the lid for the final 30 minutes of cooking to allow the stew to thicken and the flavors to concentrate.

Discard the bay leaves before serving hot with a slice of crusty rye bread or boiled potatoes.