Chinese Five Spice Pork Tacos with Nectarine Salsa

Name: Chinese Five-Spice Pork Tacos with Nectarine Salsa
Ingredients: 1 pork tenderloin, about 1 1/2 lb. (750 g); 2 tsp. canola oil; 1 Tbs. Chinese five-spice powder; Kosher salt and freshly ground pepper; 3 nectarines, each pitted and cut into 4 wedges; 2 tsp. olive oil; 1 Tbs. fresh lime juice; 2 tsp. seeded and minced jalapeño chile; 2 Tbs. chopped fresh cilantro; 2 Tbs. chopped red onion; 10 to 12 flour or corn tortillas, warmed; 3/4 cup (6 oz./185 g) sour cream (optional)