In a small bowl, stir the honey, apricot preserves, and mustard. Use two-thirds of the sauce to marinate the pork for at least 30 minutes.
Preheat oven to 350 degrees F. Line a baking pan with aluminum foil, as honey tends to blacken quickly when heated for extended periods of time. Grease the foil well so that the pork does not stick. Place tenderloin in the center of the pan and bake for 40 minutes. Remove from the oven and let the pork stand for 10 minutes before slicing.
Pour the remaining third of the honey apricot dijon sauce evenly over the slices before serving.