01 -
Preheat your oven to 425°F (220°C).
02 -
Combine the breadcrumbs, onion, garlic, melted butter, and parsley in a large bowl. Mix well to create a flavorful stuffing.
03 -
Slice the beef tenderloin lengthwise into a pinwheel shape. Work slowly, cutting about an inch deep while gently unrolling the meat as you go until it lies flat.
04 -
Spread the stuffing mixture evenly over the flattened tenderloin. Roll the meat back up tightly and secure with butcher's twine. Season the outside with salt and pepper.
05 -
Place the stuffed tenderloin on a wire rack inside a roasting pan. Roast for 50–70 minutes, until internal temperature reaches 135°F (57°C) for medium-rare or 150°F (66°C) for medium, as it will continue cooking during rest.
06 -
Let the roast rest for 10 minutes before slicing into thick pinwheels. Serve warm.