Preheat oven to 425°F.

Combine 1 tablespoon mustard, salt and pepper in a small bowl; rub all over pork. Heat oil in a large ovenproof skillet over medium-high heat. Add pork and brown on all sides, 3 to 5 minutes. Transfer the pan to the oven and roast until an instant-read thermometer inserted in the center registers 145°F, about 15 minutes. Transfer to a cutting board and let rest for 5 minutes.

Adapted from Eating Well recipe.