Beurre Blanc
The classic butter emulsion sauce from the Loire Valley. A perfect beurre blanc demands an understanding of emulsion, temperature and timing.
In brief
Beurre blanc (French for "white butter") is a warm butter emulsion sauce built on a reduction of white wine, white wine vinegar and shallots, into which cold butter is whisked in small pieces to form a light, creamy emulsion.
- Emulsion: beurre blanc is an unstable oil-in-water emulsion, stabilised by the milk proteins and phospholipids in butter. (Harold McGee, On Food and Cooking, 2004)
- EU Regulation 2991/94 stipulates that butter must contain a minimum of 80% fat — this fat content is essential for a proper emulsion
- The sauce originates from the Loire Valley, documented in Auguste Escoffier, Le Guide Culinaire (1903) as part of the classical French sauce repertoire
- Stability zone: the emulsion is stable between 50-65°C — above 70°C the emulsion breaks. (Larousse Gastronomique)
The science of emulsion
Emulsifier
Casein, whey proteins and lecithin from butter stabilise the fat-water interface. (McGee, 2004)
Emulsion type
Oil-in-water: fat droplets dispersed in the aqueous reduction — the reverse of butter itself
Critical temperature
Above 70°C milk proteins denature: emulsifying power disappears and the sauce breaks. (Larousse Gastronomique)
Role of cold butter
Gradual melting = controlled release of emulsifiers at the interface. (McGee, 2004)
Step-by-step method
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1
Mince the shallots
Mince shallots finely: even pieces for even extraction.
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2
Combine in saucepan
Combine in a saucepan: shallots + white wine + white wine vinegar in a 1:1 ratio.
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3
Reduce
Reduce over medium-high heat until 2-3 tablespoons of liquid remain.
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4
Strain the reduction
Strain the reduction (optional: keep solids for a more intense flavour).
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5
Allow to cool
Remove pan from heat — let it cool to approximately 50-60°C.
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6
Cut cold butter into cubes
Cut cold butter into cubes of approximately 1 cm and keep them cold.
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7
Add first cube of butter
Add one cube of cold butter to the reduction.
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8
Whisk the cube in
Whisk the cube in until fully incorporated. Constant movement is essential.
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9
Add the next cube
Add the next cube — never two at a time.
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10
Regulate temperature
Regulate temperature: alternate between low heat and off the heat to maintain 50-65°C.
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11
Keep whisking
Keep whisking and adding butter until the desired consistency is reached.
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12
Taste and serve
Taste and season — serve immediately, this sauce does not wait. Hold for a maximum of 2 hours at 50-60°C.
HACCP temperature control
Temperature control for beurre blanc. Keep the sauce within the stability zone of 50-65°C at all times.
Temperature control for beurre blanc
- Stability zone: 50-65°C — keep the sauce within this range at all times (Larousse Gastronomique)
- Above 70°C: emulsion breaks — fat separates from liquid
- Below 40°C: butter solidifies — sauce becomes thick and grainy
- Maximum holding time: 2 hours at 50-60°C in a bain-marie
- Never reheat after full cooling — the emulsion cannot be restored
- HACCP danger zone: 7°C-60°C — always hold above 60°C when serving (EU Regulation 852/2004)
Sources: Larousse Gastronomique; EU Regulation 852/2004 on food hygiene
Beurre Blanc vs other butter sauces
| Sauce | Base | Emulsifier | Temp. | Stability |
|---|---|---|---|---|
| Beurre Blanc | Wine/vinegar reduction | Butter proteins & lecithin | 50-65°C | Moderate (make quickly) |
| Hollandaise | Egg yolk emulsion | Lecithin (egg yolk) | 60-70°C | Moderate (pasteurisation risk) |
| Beurre Monte | Warm water | Butter proteins & lecithin | 80-85°C | Stable |
| Beurre Noisette | None | No emulsion | High | N/A |
Source: Larousse Gastronomique; Harold McGee, On Food and Cooking (2004)
Frequently asked questions
Why does my beurre blanc break?
Can you make beurre blanc in advance?
Which wine do you use for beurre blanc?
What is the difference between beurre blanc and hollandaise?
Does the butter always have to be cold?
Can you freeze beurre blanc?
Legal information & disclaimer — click to read
Informational disclaimer
The information on this page is intended solely for educational and informational purposes for hospitality professionals. KitchenNmbrs B.V. strives for accuracy and timeliness but cannot guarantee that all information is fully correct, complete or up-to-date at all times. Culinary techniques, scientific insights and food safety guidelines may change.
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Applying the techniques described requires professional expertise and training. KitchenNmbrs is not liable for damage, injury, illness or loss resulting from the application of information from this website without adequate professional guidance or verification. Every kitchen, every product and every environment is different: always apply your own professional judgement.
Food safety & HACCP
The HACCP guidelines, temperatures and storage advice on this page are based on Codex Alimentarius (WHO/FAO) as the global baseline standard and EU Regulation 852/2004. Local laws and regulations may differ. Always consult your national food safety authority for the applicable standards in your region:
- Netherlands: NVWA (nvwa.nl)
- Belgium: FAVV (favv-afsca.be)
- Germany: BfR (bfr.bund.de)
- United Kingdom: FSA (food.gov.uk)
- United States: FDA (fda.gov) — FDA Food Code
- EU general: EU Regulation (EC) 852/2004 on food hygiene
- International: Codex Alimentarius CAC/RCP 1-1969 (revised 2020)
Allergens & dietary information
Allergen information is indicative. When in doubt about allergens in preparations, always contact the supplier or a certified allergological adviser. KitchenNmbrs accepts no liability for allergic reactions or diet-related harm.
Copyright & sources
All sources mentioned (Escoffier, McGee, CIA Professional Chef, etc.) are the property of their respective publishers and authors. KitchenNmbrs cites these works in accordance with fair use for informational purposes. The source attribution at the bottom of each technique page is not a complete bibliography but an indication of primary sources consulted.
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- Auguste Escoffier — Le Guide Culinaire (Flammarion, 1903)
- Larousse Gastronomique (Larousse, 2009)
- Harold McGee — On Food and Cooking (Scribner, 2004)
- EU Regulation 2991/94 — butter composition
