In a small bowl, combine the dijon mustard, lemon juice, zest, olive oil, and rosemary.
Trim any fat or silver skin from the pork loin then coat with the mustard mixture.
Put aside for the flavors to impart and prepare the vegetables.
Roast Vegetables
Peel then cut the carrots and potato into pieces the same size as the brussels sprouts.Tip: The vegetables being the same size allows them to cook at the same rate so there are not raw ones and overcooked ones in the same pot.
Remove any old or damaged leaves from the brussels sprouts then with a knife square off the bottom.
To Cook
Preheat the skillet or Dutch oven to 360 degrees F (180 degrees C).
Sprinkle the olive oil over the bottom of the preheated skillet then add the prepared vegetables and toss or stir to cover with the oil. Sprinkle with salt.
Place the prepared pork loin on top of the vegetables.
Cook at 360 degrees F (180 degrees C) until the pork is at your preferred doneness, approximately 90 minutes.Tip: The skillet can be placed in any form of camp oven or if using a Dutch oven it can be cooked in it with the use of charcoal.