Roast beef fillet is a tender, lean whole cut roasted with a savory coating of mustard, garlic, and herbs, then sliced into neat medallions. A brief sear builds a browned crust, while a thermometer and a proper rest help keep the center juicy; serve it warm for dinner or chilled in sandwiches.
Ingredients
- 1 center-cut beef tenderloin fillet, trimmed and tied, about 2½ lb (1.13 kg)
- 1½ tsp (9 g) kosher salt
- ½ tsp (1 g) freshly ground black pepper
- 1 tbsp (15 ml) olive oil
- 2 tbsp (30 g) Dijon mustard
- 2 tbsp (28 g) unsalted butter, softened
- 2 garlic cloves, finely grated or minced, about 2 tsp (6 g)
- 1 tbsp (3 g) finely chopped fresh rosemary
- 1 tbsp (3 g) finely chopped fresh thyme leaves
Instructions
- Prepare the beef. Take the tenderloin out of the refrigerator while you heat the oven to 425°F (220°C). Pat it very dry with paper towels. If it is not already tied, use kitchen twine to tie it at 1½-inch (4-cm) intervals so the tapered tail is tucked under and the roast is an even thickness. Season all over with the salt and pepper. Let it stand while the oven heats, about 15 minutes; do not leave raw beef at room temperature for more than 2 hours total.
- Make the herb coating. Stir together the Dijon, softened butter, garlic, rosemary, and thyme in a small bowl. Set aside. Place an oven-safe skillet over medium-high heat and add the olive oil. When the oil is shimmering, sear the beef for about 2 minutes on each of its long sides, then turn it briefly to brown the ends. Use tongs rather than a fork to handle the roast.
- Coat and roast. Transfer the skillet from the heat. Spread the mustard-herb mixture over the top and sides of the beef. If your skillet is not oven-safe, move the roast to a small roasting pan, placing it on a rack if you have one. Roast uncovered until a thermometer inserted into the thickest center reaches at least 145°F (63°C), the USDA FSIS safe minimum for whole cuts of beef. Begin checking after about 20 minutes; a 2½-pound fillet commonly takes around 20–30 minutes in the oven after searing, but its shape and starting temperature matter more than the clock. Avoid touching the pan or bone with the thermometer probe.
- Rest, then slice. Move the roast to a clean cutting board and rest it for at least 3 minutes, loosely covered with foil. The 145°F (63°C) reading plus this 3-minute rest meets the USDA FSIS guidance for whole cuts. For easier carving, wait 10 minutes if time allows; the brief rest is included in the total recipe time. Remove the twine and slice across the grain into ½-inch (1-cm) pieces. Spoon any juices from the board over the slices.
Tips
- Choose a fairly even piece. A center-cut tenderloin roasts more evenly than a thin tail-end piece. Ask the butcher to trim and tie it, or tuck the narrow end underneath and tie it securely at regular intervals.
- Use a thermometer, not a color test. Beef can look pink or brown at different temperatures, and oven timing varies with the roast’s thickness. Check the center with an instant-read thermometer, and wash the probe between uses if it touches a surface that is not clean.
- Make a simple substitution. If fresh herbs are unavailable, use 1 tsp (about 1 g) dried rosemary and 1 tsp (about 1 g) dried thyme in place of the fresh herbs. The flavor will be more concentrated and less fresh-tasting; do not substitute dried herbs by the same volume.
- Keep the coating in place. Patting the beef dry before searing helps it brown. Let the skillet cool briefly before spreading the butter mixture so it does not melt and run off immediately.
Serving Suggestions
Serve the slices with roasted potatoes, crisp green beans, glazed carrots, or a simple green salad. A pan sauce is optional: after moving the roast to rest, carefully pour off excess fat, add ½ cup (120 ml) beef stock to the skillet, and scrape up the browned bits over medium heat. Simmer briefly, then taste and season; avoid adding salt until you know how salty the stock is. Horseradish cream, Dijon, or a red-wine sauce also suits the beef. For a special meal, arrange the slices on a warm platter and bring the sauce separately so the crust stays intact.
Variations
For a peppery crust, increase the black pepper to 1 tsp (2 g) and add 1 tsp (2 g) crushed coriander seeds. For a milder, less tangy coating, replace the Dijon with 2 tbsp (30 g) softened butter and add an extra pinch of salt. You can also change the herbs to 1 tbsp (3 g) chopped parsley and 1 tsp (1 g) chopped tarragon for a lighter, slightly anise-like aroma. Keep the cooking method and thermometer target the same for each version.
Storage and Reheating
Refrigerate leftover beef within 2 hours of cooking, in a covered shallow container; it keeps for 3–4 days at 40°F (4°C) or below. For longer storage, freeze tightly wrapped portions for up to 2–3 months for best quality, then thaw in the refrigerator. Reheat sliced beef gently in a covered oven-safe dish with a spoonful of stock or pan juices at 300°F (150°C), until leftovers reach 165°F (74°C), as USDA FSIS advises. Reheating to that temperature can cook the beef further, so chilled slices are often better served cold in sandwiches or salads.
Frequently Asked Questions
Can I cook roast beef fillet ahead?
Yes. Roast it, rest it, and refrigerate it promptly once it has stopped steaming heavily; do not leave it out for more than 2 hours. Serve chilled or reheat portions to 165°F (74°C). For a dinner service, you can also prepare the mustard-herb mixture and tie the beef earlier, keeping both refrigerated until roasting.
Why is my fillet cooking faster than the recipe says?
Roasting time depends on the roast’s thickness, how cold it was when it went into the oven, and how accurately the oven holds its temperature. Start checking early and use a thermometer in the thickest part; remove the beef only once it reaches the USDA safe minimum of 145°F (63°C), then rest it for at least 3 minutes.
Should I cover the beef while it roasts?
No. Roast it uncovered so the surface can brown. Loosely tent it with foil only after it comes out of the oven, while it rests; a tight covering can trap steam and soften the crust.
Can I use this recipe for a different cut of beef?
The seasoning works on other tender roasts, but cooking time will change with the cut’s size, shape, and fat. A beef sirloin roast, for example, may need longer than a similarly sized tenderloin. Use a thermometer and follow the same 145°F (63°C) safe minimum and 3-minute rest for whole cuts.
Do I need to sear the beef first?
Searing is not required to make beef safe, but it adds browned flavor and color. If you skip it, spread on the herb coating and roast directly; expect a paler exterior, and rely on the thermometer rather than adding an arbitrary amount of cooking time.
How thick should I slice the roast?
For a warm main course, slices about ½ inch (1 cm) thick hold together and show the center well. For sandwiches, slice it more thinly after chilling, using a sharp knife and cutting across the grain for a more tender bite.
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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes
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