Slow-Roasted Beef Tenderloin
Slow-roasted tenderloin with a herb crust, sliced rosy-pink — classic-dinner elegance without the stress.
In a nutshell: This authentic american slow-roasted beef tenderloin comes together in just 1 hr 25 mins using simple whole ingredients. The chef's secret: An untied tenderloin has a thin tail that overcooks while the center is still rare —. Perfect for home cooks seeking a dependable, restaurant-quality finish with minimal effort.
Beef tenderloin slow-roasts under a garlic-herb crust and slices rosy-pink. An elegant classic dinner that is easier than it looks.
Key Equipment
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- Large roasting pan with rack
- Instant-read thermometer
- Kitchen twine
- Small mixing bowl
Chef's Pro-Tips
- Tie it evenly: An untied tenderloin has a thin tail that overcooks while the center is still rare — tying (and tucking the tail) is what makes the slices even.
- Pull it 10 degrees early: The sear and the rest both add heat, so pull at 125°F for a final medium-rare — pull at 135°F and you will serve medium-well.
- Rest before slicing: Cutting early spills the juices onto the board instead of keeping them in the meat — 15 minutes is the minimum.
Ingredients
8
servings
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1 whole beef tenderloin, about 4 lbs, trimmed and tied
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3 tbsp Dijon mustard
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4 cloves garlic, minced
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2 tbsp fresh thyme leaves
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1 tbsp fresh rosemary, finely chopped
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2 tbsp olive oil
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2 tsp kosher salt
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1 tsp black pepper, coarsely ground
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½ cup sour cream, for horseradish sauce, optional
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2 tbsp prepared horseradish, for horseradish sauce, optional
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1 tsp lemon juice, for horseradish sauce, optional
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Step-by-Step Instructions
Prepare the Tenderloin
Take the tenderloin out of the fridge 1 hour before cooking. Pat it dry, and if it is not already tied, tie it at 2-inch intervals with kitchen twine so it cooks evenly. Tuck the thin tail end underneath.
Coat with Herb Mustard
In a small bowl, mix the Dijon, garlic, thyme, rosemary, olive oil, salt, and pepper into a paste. Rub it evenly all over the tenderloin.
Slow Roast
Set the tenderloin on a rack in a roasting pan and roast at 275°F (135°C) for about 1 hour, until an instant-read thermometer in the thickest part reads 125°F (52°C) for medium-rare.
Sear for Color
Heat a large skillet over high heat with a slick of oil, or raise the oven to 500°F (260°C). Sear the tenderloin on all sides for 1-2 minutes per side until deeply browned.
Rest and Slice
Rest for 15 minutes before slicing — the temperature will rise to about 135°F (57°C). Slice into 1-inch medallions and serve with horseradish sauce made from the sour cream, horseradish, and lemon juice.
Chef Clara's Kitchen Picks
Kitchen EssentialsAs an Amazon Associate I earn from qualifying purchases.
Nordic Ware Naturals Half Sheet, 2-Pack
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Silicone whisks safe for nonstick pans, in two sizes.
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Stainless racks that fit half sheets – for cooling bakes and crisping roasts.
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Six speeds with a snap-on storage case for the beaters.
View on AmazonFrequently Asked Questions
Filet mignon is a steak cut from the tenderloin. This recipe roasts the whole tenderloin, then slices it into medallions that are essentially thick filets.
You can slow-roast it a few hours ahead, then sear and rest just before serving. Do not slice it ahead — sliced tenderloin dries out quickly.
Creamy mashed potatoes, roasted asparagus, or a simple green salad all work beautifully, plus horseradish sauce for the table.
Remove the silverskin — the shiny, tough membrane — with a thin, sharp knife, sliding just under it. Leave the fat cap in place; it bastes the meat as it roasts.
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