This is the holiday-worthy dinner that LOOKS impossibly fancy but actually takes just 1 hour to make. Beef tenderloin with roasted potatoes takes a beef tenderloin (filet) generously seasoned with salt, pepper, garlic, and rosemary, sears it on all sides in a hot cast iron skillet, then roasts it to a perfect medium-rare at 425°F — served sliced with crispy garlic-rosemary roasted baby potatoes and herb compound butter melting on top.
Fun fact: beef tenderloin (also called filet mignon when cut into individual steaks) is the most tender cut of beef because the muscle it comes from doesn’t do any work. Cattle barely use their tenderloin muscle, so it develops no toughness. The cut accounts for only 2% of a cow’s total weight, which is why it commands the highest price per pound. The classical French preparation is exactly what we’re doing here.
Why this recipe works
- SEASON HEAVILY. Tenderloin is mild — needs aggressive seasoning. Use 1.5x the salt you think.
- SEAR THEN ROAST. Crispy crust comes from screaming-hot cast iron. Even cooking comes from gentle oven heat. Both are essential.
- REST 10 MINUTES. Slicing immediately loses all juices. 10 min rest = juicy slices.
Nutrition information
- Calories: 540 kcal per serving
- Protein: 38 g
- Carbohydrates: 30 g
- Fat: 28 g
- Iron: 30% DV
- Vitamin B12: 60% DV
Pro tips for the best beef tenderloin with roasted potatoes
- Use a MEAT THERMOMETER. 125°F for medium-rare (recommended), 130°F medium, 140°F medium-well. Don’t guess.
- Cast iron > regular skillet for the sear — retains heat better, gets crustier. If no cast iron, sear in stainless steel.
- Trim silver skin before seasoning — the white connective tissue makes meat chewy. Slip a sharp knife under and slice it off.
- Make the herb butter ahead — even better after 2 hours of flavor development.
Frequently asked questions
How do I tell when it’s done?
ONLY by internal temperature. 125°F medium-rare, 130°F medium. Color is unreliable. Insert thermometer in the thickest center part.
Can I cook it ahead?
Best served right after resting. To prep ahead, sear and trim 2 hr ahead, refrigerate. Roast just before serving.
What if my tenderloin is bigger or smaller?
2 lb = 20-25 min. 3 lb = 30-35 min. Add 5 min per pound. ALWAYS check internal temp instead of relying on time.
What sides go best?
Roasted asparagus, sautéed spinach, creamed spinach, Yorkshire puddings, dinner rolls, mushroom gravy, red wine reduction.
Can I use a different cut?
This recipe is for tenderloin specifically. For other cuts (ribeye roast, sirloin) adjust temp and time — those cuts have different shapes and densities.
