Place sauce ingredients in a food processor and puree until smooth. Transfer to a pot and simmer, loosely covered, over medium-low heat 15 minutes. While this occurs, preheat the barbecue to medium heat. Brush the tenderloin with the oil, and then rub with the basil, oregano, salt and pepper. Grill, covered, turning occasionally, 12-15 minutes, or until just cooked through. Rest the pork 5 minutes, and then thinly slice. Serve pork slices on pools of sauce. Garnish with basil.