1 medium onion, finely chopped
4 cloves garlic, peeled and crushed
1/2 cup fresh orange juice
1/2 cup fresh grapefruit juice
1/3 cup fresh lemon juice
2 tablespoons brown sugar
3 bay leaves, crumbled
2 teaspoons salt
2 teaspoons chili powder
1 teaspoon ground allspice
1 teaspoon ground black pepper
1 (5- to 6-pound) Boston butt pork roast or pork shoulder
1 tablespoon vegetable oil
Garnish as you please with lemon slices etc.
Combine first 11 ingredients in a large bowl. Add pork roast, turning to coat with marinade. Cover and refrigerate roast at least 4 hours or overnight.
Remove roast from marinade, reserving marinade. Brown all sides of roast in hot oil in a Dutch oven. Add reserved marinade.
Bake, covered, at 275° for 6 to 7 hours or until meat can be shredded. Garnish, if desired.