Place your pork roast in a roasting pan or other large pan.
Add about 1" water to bottom of pan.
Add seasonings: a pinch of rosemary, a pinch of thyme, 1 teaspoon parsley, salt and pepper are all good, but salt and pepper are fine as the only seasonings if you do not have the others.
Cover with tin foil and seal good around the edges.
Bake at 350 degrees F for 1 hour.
Add chunks of potatoes, 1" pieces of carrot, 1" pieces of celery, and 1 large onion, cut up.
Place the tin foil back on, seal well around the edges and bake 45 minutes.