Combine orange juice, soy sauce, garlic cloves, ginger root, salt and pepper to make the marinade.
Marinate pork for 2 hours or overnight, turning occasionally.
Preheat oven to 350°F and cook in oven for 1 hour, brushing and turning occasionally. Transfer the pork to the barbeque and grill for approximately 30 minutes, turning and brushing frequently or completely cook in oven.
Remaining marinade can be used for gravy by boiling for 1 minutes and thickened with cornstarch solution (1 part cornstarch to 4 parts water).
Home cook submitted photo used a pork tenderloin in lieu of a pork loin and cut recipe ingredients and cooking times to 1/3 (results in serving 2)