Cut tenderloin into eight pieces; flatten each piece to 1-in. thickness. Sprinkle cayenne on both sides if desired. In a large skillet, cook pork over medium heat for 3-4 minutes on each side or until no longer pink., Meanwhile, in a small saucepan, combine the preserves, vinegar, ketchup, soy sauce and horseradish. Add garlic; cook 1 minute longer. Simmer, uncovered, for 3 minutes, stirring occasionally. Serve with tenderloin; garnish with raspberries if desired.