How to Make It
Preheat oven to 450°F. Rub tenderloin with oil, pepper, and 1 teaspoon of the salt. Place pork in a large ovenproof skillet over medium-high; cook until browned on both sides, about 2 minutes per side. Place skillet in preheated oven, and cook until a meat thermometer inserted in thickest portion registers 145°F, about 10 minutes. Let stand 10 minutes before slicing.
Melt butter in a small skillet over medium. Cook, stirring occasionally, until foam subsides and butter turns golden brown, about 4 minutes. Remove from heat, and stir in raisins, olives, parsley, vinegar, sugar, and remaining ¼ teaspoon salt. Serve over pork.