1/2 cup soy sauce
2 oranges, juices
1 lime, juiced
1 tablespoon Dijon mustard
1 teaspoon fresh ginger
1 clove garlic, crushed
1 tablespoon chopped scallions
1 pork tenderloin (about 12 ounces)
Olive oil, for brushing
Combine marinade ingredients in measuring cup and stir to combine. Place the pork tenderloin in a plastic, sealable bag. Pour marinade over the tenderloin and seal bag. Marinate overnight in the refrigerator.
Remove pork tenderloin from marinade - reserve marinade. Preheat oven to 475 degrees. Place the pork loin on a rack in a roasting pan.
Roast the pork for 30 minutes, then reduce the heat to 425 degrees F and roast for an additional hour. Test for doneness using an instant-read thermometer. When the internal temperature reaches 155 degrees F, remove the roast from the oven. Allow it to sit for about 20 minutes before carving. It will continue to cook while it rests.
While meat is in the oven, bring reserved marinade to a boil in a small saucepan, then lower the heat and gently simmer until it is reduced to about 2 tablespoons. Stir occasionally. Drizzle a small amount of marinade over each piece of meat.