2 tbsp olive oil
1.5 lb pork loin
salt / pepper
1/2 cup red wine vinegar
1/2 cup dijon mustard
1/4 cup chopped parsley
Heat oven to 400. Heat oil in cast iron skillet. Season pork with salt & pepper. Sear pork on all sides until browned, 6-8 minutes.
Transfer skillet to oven and continue roasting until internal temperature reaches 140.
Remove pork from skill, let rest for 5 min.
Add vinegar, mustard, and parsley to the hot skillet. Stir to combine.
Slice pork. Add pork slices to mustard sauce in skillet. Continue to cook on low until pork reaches desired doneness. Serve immediately.