2) Season the pork and the chicken with salt and pepper. Add the pork pieces to the bacon fat and brown on all sides. Remove from the pan and set aside on a large plate. Add the chicken thighs to the pan and brown evenly, then remove and add to the plate with the pork.
3) Add the onions, carrots and celery to the pan and cook for 3 to 5 minutes. Stir in the garlic and cook for 1 minute more. Whisk in the flour and cook for 2 minutes, then add the stock, bay leaves, thyme and sage and combine well.
4) Put the pork and chicken pieces into the sauce and cover. Reduce the heat and simmer until the meat is fork tender, about 2 hours.
5) Add the cannellini beans and cover and simmer for 25 minutes. Transfer to a serving platter and serve hot with a drizzle of the sherry wine vinegar and a sprinkle of the parsley.