Follow the microwave manufacturer's guidelines for defrosting meat. Cook meat immediately after microwave thawing.
It is safe to cook frozen or partially-frozen pork in the oven, on the stove or grill without defrosting it first. The cooking time may be about 50 percent longer. Use a meat thermometer to check for doneness. It is best if frozen pork roasts are cooked at an oven temperature of 325° F. Do not cook frozen pork in a slow cooker.