04To make the sauce, place the parsley and garlic in a food processor and pulse until the parsley is finely chopped. Add the red pepper flakes, salt, red wine vinegar and the roasted tomatoes from the beef pan and process until pureed. Add the olive oil in a steady stream with the machine running.05To serve, slice the roast and place on a serving platter. Drizzle a little sauce over the meat. Serve the remaining sauce in a small bowl alongside.