Cook the barley according to the package instructions. This recipe will need 400 g (1 pound) of cooked barley.
Place a large pot over medium heat. Add the diced onion and chopped bacon. Saute on low heat for 6 minutes, stirring occasionally. Add the minced garlic, cook for a minute, and then add the meat. First, add the veal, cook for a minute or two, then add the pork, cook for a minute or two, and lastly, add the turkey. Cook the meat for a total of 10 minutes.
Season the meat with mushroom powder, herbs, and spices. Add in frozen or fresh forest mushrooms. Stir and cook for 2 - 3 minutes, then add the cooked barley and 1500ml (6 1/4 cups) water. Season with salt and pepper, stir, and cook covered on low heat for about 1 hour or until the meat is almost cooked.
Add the potato cut into cubes. Cover the pot with a lid and cook for 20 - 30 minutes or until the potatoes are soft.
Before serving, add the apple cider vinegar and optionally stir in one tablespoon of chopped parsley. Divide between eight plates and serve.