One good way to prepare a pork loin roast is the follow the roast pork loin recipe from the Food Network Kitchen. A boneless center-cut pork loin is seasoned, seared and then roasted in an oven until it is done.
To make roast pork loin, heat 1 tablespoon of vegetable oil in a large ovenproof skillet over high heat. Meanwhile, use kosher salt and freshly ground black pepper to season a center-cut boneless pork loin on all sides. In a small bowl, combine 2 tablespoons of whole grain mustard with 2 tablespoons of cider vinegar, and set it aside.
When the oil is hot, place the pork loin in the skillet, and sear it until all sides are golden brown. Brush the mustard and vinegar mixture over the pork until it is gone, and transfer the skillet to a 375 degree oven. Roast the pork loin in the oven for approximately 35 minutes, or until a meat thermometer inserted into its center reads at least 145 degrees Fahrenheit. When it is done cooking, transfer the pork loin to a cutting board, and tent it with foil. Allow it to sit under the foil for 10 minutes before slicing and serving.