how long do i cook pork tenderloin
1 Place the tenderloin in a roasting pan. 2  Place the pan in the oven and roast for about 15 minutes, or until the internal temperature reaches 145 degrees Fahrenheit (63 degrees Celsius). 3  Allow the pork to rest for 10 minutes before serving.arinate the tenderloin. A marinade is similar to a brine, but instead of water you soak the pork in a mixture of vinegar, oil and spices. Make a marinade with 1/2 cup olive oil (118 ml) and 1/2 cup (118 ml) vinegar. Mix in a teaspoon of each of your favorite spices.