1. You should start the recipe by dissolving some salt in water in a big bowl or ziptop bag.
2. You should remember to remove the silverskin from the pork tenderloin and place it in the saltwater solution in a bowl or ziptop bag. You need to also make sure the water thoroughly surrounds and covers the pork tenderloin.
3. You should refrigerate this solution for a minimum of 30 minutes, but preferably two hours.
4. When you think you are ready to start cooking, you will need to rinse the pork tenderloin after removing it from the liquid. Then proceed to throw away the liquid.
5. Preheat the oven to 350 degrees Fahrenheit.
6. You should tuck the pork tenderloin’s narrow side inside, you can hold it using metal skewers or butcher’s twine.
7. Proceed to season to taste with salt and pepper. Remember that the pork tenderloin was already brined in salt, so make sure you don’t add a lot of salt.
8. You should place the pork tenderloin in a baking dish that easily fits it without bending it.
9. Go ahead and bake the tenderloin uncovered for 20 – 27 minutes until an instant-read thermometer registers 145°F internal temperature.
10. You should allow the pork tenderloin to rest for 5 minutes on a cutting board before slicing it into ½-inch slices and serving.

You can watch this video recipe to know how long to cook pork tenderloin in the oven at 350.