For a spicier salsa, leave some seeds in the jalapeño, or add a pinch of red pepper flakes. If you don't have a grill, you can sear the tenderloins in a hot skillet on the stovetop and then finish cooking them in a 350°F (175°C) oven. The salsa can be made a day ahead of time; the flavors will meld beautifully. Ensure your grill grates are clean and well-oiled to prevent the pork from sticking during searing.