How to Make It
In a large, resealable plastic bag, combine the wine, rosemary, sage, red onion, celery, carrot, bay leaves, peppercorns, juniper berries and cloves. Add the pork and seal the bag, pressing out the air. Refrigerate for at least 6 hours or overnight.
Rinse off the pork and discard the marinade. In a medium enameled cast-iron casserole, cover the pork cubes with 2 inches of water and bring to a boil. Simmer for 10 minutes, then drain. Pat the pork dry.
Wipe out the casserole, add the olive oil and heat until shimmering. Add the pork cubes, celery, carrot, red onion and garlic and cook over moderate heat, stirring occasionally, until the meat and vegetables are lightly browned, about 10 minutes. Add the sage and rosemary, season with salt and a pinch of crushed red pepper and cook for 1 minute. Add the wine and simmer over moderate heat until it's nearly evaporated, about 10 minutes. Stir in the tomato paste. Add the chicken stock and spice bundle and bring to a boil.
Partially cover the casserole and cook the stew over very low heat until the meat is very tender and the liquid has reduced by half, about 1 hour and 45 minutes.
Meanwhile, bring the 8 cups of water to a boil in a large saucepan. Whisk in the polenta in a thin stream. Cook the polenta over low heat, whisking constantly, until it begins to thicken, about 5 minutes. Continue cooking over low heat, stirring frequently with a wooden spoon, until the polenta is very thick and no longer gritty, about 30 minutes. Stir in the butter and season the polenta with salt.
Skim the fat from the stew and discard the spice bundle. Stir in the parsley and season with salt. Spoon the polenta into 6 shallow bowls, spoon the pork stew on top and serve piping hot.