What is the best way to cook a pork sirloin to ensure it is tender and flavorful?

The best way to cook a pork sirloin to ensure it is tender and flavorful is to first marinate it for a few hours in a mixture of herbs, spices, and acidic ingredients like vinegar or citrus juice. Then, sear the pork on high heat to lock in the juices, and finish cooking it in the oven at a lower temperature until it reaches an internal temperature of 145F. Let it rest for a few minutes before slicing and serving.