In a small bowl, mix orange marmalade, lemon juice, ginger, and mustard. Place pork in a medium baking dish.
Bake 20 to 25 minutes in the preheated oven, then baste with the orange glaze. Continue baking to an internal temperature of 145 degrees F (63 degrees C), about 40 minutes more. Baste with the glaze every 10 minutes while baking. Let stand 10 minutes before carving.
