Sauce béarnaise — while named for Béarn in the southwest (in honor of Henri IV, the Béarnais king) — was created in Paris at the restaurant Le Pavillon Henri IV in Saint-Germain-en-Laye in 1836 by chef Collinet, and it is a Parisian sauce in every technical sense: an emulsified butter sauce (sister to hollandaise) flavored with a tarragon-and-shallot reduction that has become the most beloved steak sauce in French gastronomy. The construction: a reduction of 60ml white wine vinegar and 60ml dry white wine with 2 minced shallots, 1 tablespoon crushed black peppercorns, and 3 tablespoons chopped tarragon stems (stems for the reduction, leaves reserved for finishing) — reduced to 2 tablespoons of intensely concentrated liquid. This reduction is cooled slightly, 3 egg yolks are whisked in, and the mixture is cooked gently over a bain-marie (never direct heat — the yolks must thicken gradually without scrambling, reaching 65°C maximum) while 250g clarified butter is added in a thin stream, whisking constantly, creating a thick, creamy, pale-yellow emulsion. Finished with 2 tablespoons chopped fresh tarragon leaves and 1 tablespoon chopped chervil. The sauce should coat a spoon thickly, taste of tarragon, shallot, and butter with a sharp vinegar backbone, and be served warm (not hot — excessive heat breaks the emulsion). Béarnaise is served exclusively with grilled or pan-seared red meat (the steak-frites-béarnaise combination is the Parisian bistro's greatest hit), with grilled fish (especially turbot and salmon), and with grilled asparagus. The sauce exists within a family: sauce Choron (béarnaise + tomato purée), sauce Foyot/Valois (béarnaise + meat glace), sauce paloise (mint replaces tarragon — for lamb). These derivatives demonstrate the classical sauce system's combinatorial logic: one master technique, multiple variations through substitution.
Reduction: vinegar + wine + shallot + peppercorn + tarragon stems → 2 tablespoons. Yolks whisked over bain-marie (65°C max). Clarified butter in thin stream. Finish with fresh tarragon + chervil. Serve warm, not hot. For grilled steak, fish, asparagus. Derivatives: Choron (+tomato), Foyot (+glace), Paloise (mint). Created 1836 at Le Pavillon Henri IV.
For rescue when the sauce breaks: add 1 tablespoon cold water and whisk vigorously — the water creates a new emulsion point. If that fails: start a new yolk in a clean bowl over bain-marie, whisk the broken sauce into it slowly — the new yolk re-emulsifies. For holding: keep in a thermos or in a bowl over barely warm water (45-50°C) — béarnaise holds for 1-2 hours. For steak-frites-béarnaise: cook bavette (flank steak) in a screaming-hot cast-iron pan with a knob of butter, 2 minutes per side for saignant — the charred meat against the rich, herbal sauce is the Parisian bistro's defining flavor combination. For sauce Choron: add 2 tablespoons concentrated tomato purée to finished béarnaise — extraordinary with grilled lamb.
Using direct heat (the yolks scramble — always use bain-marie). Adding butter too fast (the emulsion breaks — start with drops, build to a thin stream). Making the reduction too watery (it must be syrupy-thick — under-reduced = weak flavor). Using dried tarragon (fresh tarragon is non-negotiable — dried has a different, almost anise-like character). Serving too hot (above 60°C the emulsion breaks — keep warm in a bain-marie). Not straining the reduction (the peppercorns and shallot should be strained out before adding yolks — they should flavor the liquid, not appear in the sauce). Over-thickening (if too thick, thin with a few drops of warm water).
Le Guide Culinaire — Escoffier; Sauces — James Peterson; La Bonne Cuisine — Saint-Ange