1. Heat in oil in large nonstick skillet over medium heat. Add tenderloins to skillet; cook 5 minutes, turn and cook 5 minutes. Reduce heat to medium-low; cover and cook 7 minutes per side until internal temperature reaches 150°F. Remove pork from skillet and place on cutting board. Let stand 5 minutes.
2. While pork rests, add butter to the same skillet and melt over medium-low heat, scraping bottom and sides. Remove from heat, squeeze lemon into the skillet and whisk until well blended.
3. Cut one pork tenderloin into thin slices; serve with half the lemon butter spooned over slices and sprinkled with parsley. Reserve remaining tenderloin and lemon butter for Pork and White Bean Italian Soup recipe.