1 cup orange juice
1/4 cup lime juice
1 (3 pound) boneless pork loin roast
3 cloves garlic, minced
1 teaspoon dried oregano leaves
1/2 teaspoon coarsely ground pepper
1 large onion, chopped
2 stalks celery, sliced
1 large carrot, sliced
1 teaspoon salt
1/2 cup orange juice
Mix 1 cup orange juice and the lime juice; pour over pork roast in non-reactive bowl. Cover and refrigerate, turning pork occasionally, at least 4 hours.
Remove pork from juice, reserving juice. Pat pork dry. Mix garlic, oregano and pepper; rub evenly over pork. Place onion, celery and carrot in shallow roasting pan; sprinkle with salt. Pour reserved juice over vegetables. Place pork on top of vegetables. Insert meat thermometer so tip is in center of thickest part of pork and does not rest in fat. Roast uncovered at 325 degrees F, spooning juices over pork occasionally, until thermometer registers 170 degrees F, about 2 1/2 hours.
Remove pork; cover with aluminum foil and let stand 15 to 20 minutes before carving. Place vegetable mixture and 1/2 cup orange juice in blender container. Cover and blend on medium-high speed, stopping blender occasionally to scrape sides, until well blended, about 1 minute. Heat to boiling.
Serve with pork.
Yields 8 to 10 servings.