1. Preheat oven to 425ºF. Line a large baking pan with heavy-duty foil and place a wire rack inside. Sprinkle tenderloin with salt and pepper and roast for 15 minutes.
2. Combine marmalade and ground ginger. Brush all over tenderloin, and continue to roast until an instant-read thermometer inserted in thickest part reads 155ºF, about 10 minutes longer.
3. Turn oven to broil and place tenderloin under broiler to caramelize marmalade, 1 to 1 1/2 minutes (watch carefully and remove before jam starts to burn). Let stand for 5 minutes before slicing and serving.