Sausage and Potato Packet
Heat the oven to 425 degrees. Arrange a piece of heavy duty aluminum foil about 18 inches wide by 36 inches long on a cookie sheet so that half of the foil covers the pan and the remainder extends beyond it at either end. Pour the olive oil over the foil covering the pan, then rub the onion halves in the oil to coat them. Distribute the potatoes and garlic around the onions and sprinkle with the salt. Finally, scatter the sausages throughout the vegetables and place the rosemary on top. After making certain that the ingredients are in one layer in the foil on the pan, fold the foil overhang over the mixture and fold in the sides to secure the stew in a tight casing.
Bake the foil package for one hour. Using pot holders, transfer the package from the pan to a platter. Open the foil carefully, sprinkle the stew with the parsley and serve directly from the package.