Place your pork roast in a roasting pan. This can be with our without a rack, your preference is fine. I have done this both ways.
Sprinkle the roast with salt and pepper.
Begin baking the roast for 45 minutes.
Meanwhile combine the cranberry sauce, orange juice, and brown sugar in a saucepan over medium heat. Let it simmer until the cranberry sauce is melted, stirring occasionally.
Divide the glaze in half. One half will be used for brushing the roast, the other half will be used as a sauce when serving.
Keep the "brushing" glaze warm while the roast continues to bake. The other can simply be heated when it is time to serve the roast.
After the first 45 minutes of baking, brush the top of the roast with the glaze that you have made. Continue to bake. Do this every 10-15 minutes, until a thermometer reads 170 degrees in the center. The total time will vary depending upon the size of your roast, so the time given for this recipe is an estimate. Trust your thermometer.
Allow the roast to rest 10-15 minutes, then slice across with a sharp knife or electric carving knife (my preferred method.)