Cut the celery stalk into small pieces.
Place the pork in a bowl. Add the Provencal herbs, crushed peppercorns, vegetable oil, salt and barberry.
Add chopped celery and stir.
Place the meat in a roasting bag. Tie the bag at both ends and make a few holes in it to allow excess steam to escape.
Place the pork in the oven to bake for 1 hour. 10 minutes before it is ready, remove the pork from the bag to brown it.
Cut the chop into slices and garnish with dill. Enjoy!