Pork with vegetables

1 x centre-cut pork loin rib end roast or possibly pork shoulder butt roast (3 lb/1.5 kg), tied 1/2 tsp each salt and pepper 2 Tbsp. vegetable oil 1 x onion ,[...]

2 each onions chopped 2 each carrots peeled, sliced 4 1/2 pounds pork loin or shoulder roast 2 teaspoons salt 1/2 teaspoon oregano leaf * 1/2 teaspoon cumin[...]