Sautéed Filet Mignon with Béarnaise

Method

1. Make the reduction. Combine vinegar, wine, shallot, and dried tarragon in a small saucepan. Simmer until reduced to about 1 tablespoon of syrupy liquid. Strain into a heatproof bowl, pressing the shallot to extract flavor. Let cool slightly.

2. Build the béarnaise. Add egg yolks to the reduction. Set the bowl over barely simmering water (the bowl shouldn't touch the water). Whisk constantly for 2–3 minutes until the yolks thicken and you can see the whisk leaving trails.

3. Add the butter in a very thin stream, whisking constantly. Start with drops, then increase to a thin drizzle as the emulsion builds. The sauce should be thick, creamy, and pale yellow. If it gets too thick, add a few drops of warm water. Stir in fresh tarragon, salt, white pepper, and cayenne. Keep warm (not hot) while you cook the steaks.

4. Sear the filets. Pat dry and season generously with salt and pepper. Heat a cast iron skillet over high heat until smoking. Add oil, then steaks. Sear for 3 minutes per side for medium-rare (130°F internal). Add butter in the last minute and baste.

5. Rest for 5 minutes on a cutting board. The temperature will rise 5°F during resting.

6. Serve with a generous spoonful of béarnaise on top. The warm, tarragon-scented butter sauce melts over the steak.

Equipment

• Cast iron skillet Recommended: Lodge 12-Inch Pre-Seasoned Cast Iron Skillet
• Double boiler or heatproof bowl over simmering water
• Whisk Recommended: OXO Good Grips 11-Inch Balloon Whisk
• Instant-read thermometer Recommended: ThermoWorks ThermoPop 2

Chef Notes

• The most important thing: Béarnaise is a warm emulsion — egg yolks holding melted butter in suspension. The yolks must be warm enough to thicken but never hot enough to scramble. Keep the heat low and whisk constantly. If the bowl feels too hot to touch, pull it off the heat.
• Make the reduction first: simmer vinegar, wine, shallot, and dried tarragon until almost dry. This concentrated flavor base is what separates béarnaise from plain hollandaise.
• Stream the melted butter in very slowly at first — a thin drizzle while whisking vigorously. Once the emulsion takes hold (the mixture thickens and turns creamy), you can add butter faster.
• Filet mignon is the most tender cut but has the least beefy flavor. The béarnaise provides the richness and flavor that the lean filet lacks. This is why the pairing is classic.
• Let the steaks rest for 5 minutes after cooking. Filet is lean — cutting too soon loses the little juice it has.

Common Substitutions

Ingredient	Substitution	Notes
Filet mignon	NY strip or ribeye	More flavor, less tender — still great with béarnaise
Béarnaise	Hollandaise + tarragon	Hollandaise is the parent sauce — add tarragon to approximate
Fresh tarragon	Chervil or chives	Different herb, similar elegance
White wine vinegar	Champagne vinegar	Slightly more delicate
Double boiler	Blender béarnaise	Blend yolks + reduction, stream in hot butter — faster, more stable

What You're Practicing

Filet béarnaise teaches you warm emulsion sauce — the technique of suspending melted butter in egg yolks using heat and agitation. Béarnaise is the tarragon-flavored daughter of hollandaise, and mastering it gives you access to the entire hollandaise family (mousseline, choron, paloise). Visit Pan and Daughter Sauces for the full sauce family tree.

You're also learning reduction-based flavoring — concentrating vinegar, wine, and aromatics into a potent base that seasons the entire sauce. This reduction technique is used in pan sauces, gastrique, and mignonette. Explore more at Pan and Daughter Sauces.