what temperature do i cook pork tenderloin on?
['Preheat oven to 400° F. ... ', 'Season the pork with salt and pepper (add chopped fresh herbs if desired).', 'Heat oil and brown the pork evenly in a frying pan. ... ', 'Cook 18-20 minutes or until a thermometer reads an internal temperature of 145° F (While the tenderloin is cooking, begin to prepare the mushroom sauce)']