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Combine wine, vinegar, and minced shallots in a heavy-bottomed stainless steel saucepan; place over medium-high heat.
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Reduce by simmering until only 20 ml liquid remains (about 4 minutes) — this is the reduction; it must be acidic and concentrated.
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3
Remove from heat; add pinch of white pepper and cool reduction to exactly 40°C (use instant thermometer); this temperature is critical — too hot breaks emulsion, too cold prevents mounting.
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4
Return to very low heat; whisk in one cube of cold butter, whisking constantly until fully incorporated — do not allow liquid to simmer.
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5
Continue whisking in butter, one cube at a time, waiting for each to emulsify fully before adding next — process takes 4–5 minutes total.
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6
When all butter is incorporated, sauce should be pale, glossy, and thick (consistency of warm hollandaise); it holds together via emulsion — lecithin in butter fat suspends in acidic liquid.
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7
Taste and adjust with salt and white pepper; if sauce breaks (looks greasy/separated), whisk in water (5 ml at a time) to re-emulsify.
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Serve immediately at 50–55°C; hold maximum 30 minutes before use.
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KEY: Reduction + low heat + constant whisking = emulsion that coats a spoon. Breaks if overheated (butter fat separates) or if cold (won't mount). Serve within 30 minutes.
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BEURRE BLANC — Emulsified Butter Sauce Technique
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Yield: 200 ml | Prep: 8 min | Total: 12 min
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150 ml dry white wine (Sauvignon Blanc or Chablis)
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13
50 ml fish or chicken stock (cold, reduced sodium)
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1 shallot (minced finely)
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1 bay leaf
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150 g unsalted butter (cold, cubed — crucial)
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15 ml cream (optional, for stability)
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Sea salt and white pepper (to taste)
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5 ml lemon juice (fresh)
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Combine white wine, minced shallot, and bay leaf in heavy-bottomed pan; reduce over medium-high heat until liquid is syrupy and reduced to approximately 30 ml (3–4 minutes).
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21
Add cold stock; reduce again until 40 ml liquid remains (1–2 minutes); this reduction is the flavour base and acidity anchor.
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22
Lower heat to minimum; whisk in two cubes of cold butter until partially incorporated; continue whisking in remaining butter cubes one at a time, never allowing sauce to exceed 55°C (131°F) on instant-read thermometer.
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Each butter cube should be mostly incorporated before adding next; emulsification occurs as lecithin molecules from butter fat coat water droplets, creating stable sauce.
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Once all butter is incorporated, whisk in cream if using (increases stability but dilutes intensity); season with salt, white pepper, and lemon juice.
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Pass through fine mesh strainer if shallot pieces remain; serve immediately or hold in warm (not hot) water bath at 48–52°C (118–125°F) for up to 20 minutes.
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KEY PRINCIPLE: Temperature control is critical — above 60°C (140°F), emulsion breaks and sauce separates. Whisk constantly to create stable water-in-fat emulsion.
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Hold the finished sauce in a bain-marie or warm corner of the stove, whisking occasionally — the gentle, indirect heat prevents both congealing and overheating
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For a richer, more stable version, whisk in 1–2 tablespoons of crème fraîche before adding butter — the stabilising effect is significant
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For variations, infuse the reduction with herbs (tarragon for béarnaise-adjacent, dill for fish), citrus zest, or roasted garlic before straining and mounting
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If the sauce begins to separate, immediately add a splash of cold water and whisk vigorously — this can rescue a sauce in early stages of breaking
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For consistency in service, pre-make a large reduction and mount to order in small portions — each portion takes under 2 minutes