Position a rack in the center of the oven and heat the oven to 250°F.
In a small bowl, combine the olive oil, thyme, garlic, 1 tsp. salt, and several generous grinds of black pepper. Put the tenderloin on a heavy-duty rimmed baking sheet or in a small roasting pan and rub the oil mixture all over it.
Roast the tenderloin until an instant-read thermometer inserted in the thickest part reads 130°F for medium rare, about 1 hour. Transfer to a carving board, tent with foil and let rest for at least 20 minutes before serving.
Cut the tenderloin crosswise into 1/2-inch slices. Serve with the ragoût.
Make Ahead Tips
You can season the tenderloin up to 6 hours ahead and refrigerate.
nutrition information (per serving):
48, Fat Calories
430, Saturated Fat
47, Monounsaturated Fat
9, Polyunsaturated Fat
Photo: Scott Phillips