Ingredients: 1.8 kg (4 lbs) floury potatoes, peeled and chopped 2 tablespoons vegetable oil 2 onions, peeled and finely chopped 2 sticks celery, finely chopped 2 carrots, peeled and finely chopped 900g (2 lbs) minced lamb 1 teaspoon salt 1 teaspoon black pepper 2 tablespoons Worcestershir…