Sauce Choron
Béarnaise enriched with tomato concassée — a daughter sauce that teaches how a finished emulsion receives new flavor without breaking.
Ingredients
- For the béarnaise base:
- 60 g white wine vinegar
- 30 g dry white wine
- 15 g shallots, finely minced
- 4 g fresh tarragon stems (reserve leaves for finish)
- 1 g whole black peppercorns, lightly crushed
- —
- 3 large egg yolks (about 60 g)
- 180 g unsalted butter, melted gently and kept warm
- 2 g fine sea salt, to taste
- 4 g fresh tarragon leaves, roughly chopped
- —
- For the tomato addition:
- 2 ripe Roma tomatoes (about 150 g), blanched, peeled, seeded, and finely diced (concassée)
- 5 g unsalted butter
- Salt and pepper to taste
Steps
Make the reduction. Combine vinegar, white wine, shallots, tarragon stems, and crushed peppercorns in a small saucepan. Simmer over medium heat until reduced to about 2 tablespoons of aromatic liquid. Strain through a fine-mesh sieve, pressing the solids firmly. Reserve.
Make the tomato concassée. Score, blanch, peel, halve, and seed the tomatoes. Dice the flesh finely. In a small pan, melt 5 g butter over medium heat and cook the tomato dice for 3–4 minutes, stirring, until most moisture has evaporated and the mixture is dry and jammy but still bright red. Season lightly, remove from heat, and keep warm.
Build the béarnaise. Whisk the egg yolks with the cooled reduction in a heat-safe bowl over a bain-marie (quiet simmering water, bowl not touching the surface). Whisk constantly until the yolks lighten, increase in volume, and hold ribbon tracks for about a second — the sabayon stage. Target 60–70°C at the bowl.
Stream in the warm melted butter very slowly at first, whisking constantly. The sauce thickens into a glossy, pale-yellow emulsion. Off heat, season with salt and fold in the chopped tarragon leaves.
Fold in the tomato concassée. Add the warm, dry tomato mixture to the finished béarnaise and stir gently to combine. The sauce becomes pale orange, flecked with tomato and tarragon. Serve immediately — Sauce Choron does not hold or reheat well.
Tools you'll want
- · Balloon whisk (24cm / 11-inch)
- · Tri-ply stainless saucepan (1.5–2 qt / 18cm)
- · Sauce strainer (chinois or perforated, 19–25cm)
- · Instant-read digital thermometer
Why this works
Sauce Choron is béarnaise plus tomato, and that simple addition opens a question that reveals something fundamental about emulsified butter sauces: at what stage do you add an ingredient, and what does it do to the structure you have already built?
The béarnaise base is an emulsified warm butter sauce, identical in construction to hollandaise except that the acid reduction includes tarragon and shallots rather than just shallots and peppercorns. The emulsification physics — yolk lecithin suspending butter fat droplets in a continuous aqueous phase — are unchanged. What changes in Choron is the moment a third element, tomato, enters after the emulsion is complete.
The tomato must arrive as a concassée: blanched, peeled, seeded, and cooked until its free moisture has evaporated. This is the critical step. Raw tomato carries about 95% water by weight. That water, if introduced into a finished emulsion, would dilute the continuous phase abruptly, shift the water-to-fat ratio, and break the sauce. The dry-cook step reduces the concassée to nearly pure tomato flesh and concentrated pectin — something that can be folded into béarnaise without upsetting the emulsion balance.
The second thing the tomato does is color. Beta-carotene and lycopene in the cooked tomato pull the sauce from pale yellow to pale orange — the visual identity of Choron. This color shift is not cosmetic; at a tasting, the orange signals "tomato" before flavor arrives, which is why Choron reads as a distinct sauce rather than a garnished béarnaise.
Temperature management throughout is the same as for béarnaise: the yolks want to live in the 60–70°C range during butter incorporation. The tomato concassée should be warm (not hot) when folded in, so it does not cool the emulsion below holding temperature.
Common mistakes
Wet tomato concassée. The most common failure. If you skip the drying step or rush it, the tomato's water enters the béarnaise and the sauce breaks or becomes thin. Cook the diced tomato until there is no visible liquid pooling around it in the pan.
Adding tomato to a broken béarnaise. Choron does not fix a broken béarnaise; it just produces broken Choron. Build a good béarnaise first, confirm the texture, then fold in the tomato.
Overheating the finished sauce. Once the tomato is incorporated, every degree above 75°C risks curdling the egg proteins. Work quickly and serve immediately.
Skipping the reduction strain. Shallot bits and peppercorn fragments in the finished sauce are a texture problem and indicate the reduction was not made carefully.
Too much tomato. The ratio should feel like an accent — about 2–3 tablespoons of concassée per 250 ml of béarnaise. More than that and the sauce becomes a tomato sauce with butter, not a béarnaise with tomato.
Stale tarragon. Béarnaise and Choron depend on tarragon's anise-adjacent brightness. Dried tarragon is not the same ingredient; use fresh.
What to look for
- Reduction: about 2 tablespoons, shallot softened, tarragon fragrant. Strain firmly.
- Sabayon: yolks light in color, voluminous, ribbon tracks lasting about one second.
- Butter stream: sauce thickens visibly from the first addition. If butter pools, you are adding too fast.
- Béarnaise before tomato: glossy, pale yellow, soft-mayo texture. Confirm this before proceeding.
- Tomato concassée: dry, jammy, no free liquid in the pan. Cool slightly before folding.
- Finished Choron: pale orange, tarragon flecks visible, holds a spoon-line for a few seconds.
Chef's view
Sauce Choron appears occasionally on bistro menus as the sauce for grilled beef or lamb, where its tomato brightness cuts through the fat of the meat in a way that plain béarnaise, richer and more forward with butter, sometimes cannot. The tomato does real flavor work, not just visual work.
From a teaching perspective, Choron is the clearest demonstration of the "daughter sauce" concept — the idea that a mother or intermediate sauce can receive a flavoring at the end and become something categorically different. The emulsion does not change; what changes is the flavor profile layered onto it. This is the model for a significant portion of classical French sauce vocabulary, where the same base mechanics recur and the distinguishing element is always added last.
Chef Test Notes
The critical test in developing this recipe was the concassée dryness. At three moisture levels — just seeded (too wet), lightly cooked for 2 minutes (borderline), and cooked for 4 minutes until jammy (correct) — only the third kept the béarnaise texture intact after folding. The 2-minute version thinned the sauce noticeably; the barely-seeded version broke it within 30 seconds of incorporation. Four minutes of dry-cooking the tomato dice is not a suggestion.
Related glossary terms
- Emulsion — the structural logic the tomato concassée must not disrupt
- Concassée — the specific tomato preparation that makes this addition safe
- Reduction — the acid concentration step that anchors the béarnaise base
- Daughter sauce — the classical category Choron exemplifies