Melt reserved fat over medium heat in large covered skillet or heavy pot until golden brown. Remove fat, leaving liquid. Add onion and cook until golden brown over medium high heat. Add pork and cook until almost completely cooked. Add mushrooms and stir. Add soy sauce and green pepper. Cook uncovered over medium heat for 5 minutes. Add green onions, parsley and cilantro and stir. Cook 5 minutes. Add dill pickles and stir. Turn off heat. Let stand for at least 10 minutes. Serve over mashed potatoes.