Beurre Blanc (White Butter Sauce)

Name: Beurre Blanc (White Butter Sauce)
Prep time: 15 min
Total time: 15 min

February 15, 2021

Prep 15 min Total 15 min

Beurre Blanc (White Butter Sauce) - kvalifood.com

Beurre blanc (“white butter”) is a warm emulsified butter sauce originating from the Loire Valley, specifically claimed by both Nantes and Angers. According to culinary legend, it was created accidentally by a chef in Nantes who forgot to add tarragon and egg yolks when making bearnaise sauce for the Marquis de Goulaise - and the result was a pure butter emulsion held together only by a reduced acid base.

Makes ca. 1 cup / 250 ml - enough for 4 servings of fish

Ingredients

250 g cold unsalted butter, cut into ~20 small pieces
2 medium shallots (30 g), finely minced
60 ml dry white wine (Muscadet or other dry Loire white preferred)
40 ml (2.5 tbsp) white wine vinegar
Fine salt
White pepper

Directions

Make the reduction: Combine the wine, vinegar, and minced shallots in a small heavy-bottomed saucepan (stainless steel or enameled - not aluminum, which reacts with acid). Bring to a boil over medium heat and reduce until only about 1-2 tablespoons of syrupy liquid remain. This takes 3-5 minutes.

Start the emulsion: Remove the pan from the heat. Add 2-3 pieces of cold butter and whisk vigorously until the butter begins to cream into the liquid, forming a pale, slightly thick base.

Build the sauce: Place the pan over the lowest possible heat. Continue adding butter pieces one or two at a time, whisking constantly. Each addition should melt into the sauce smoothly before adding the next. The sauce temperature should stay below 65C (150F) - if the bottom of the pan feels too hot to touch, pull it off the heat and keep whisking.

Finish: When all butter is incorporated, the sauce should be pale ivory-yellow, glossy, and about the consistency of thin hollandaise. Season with salt and white pepper.

Strain (optional): For a refined, smooth sauce, pass through a fine-mesh sieve, pressing the shallots to extract their flavor. For a more rustic version, leave the shallot pieces in.

Serve immediately or hold for up to 30 minutes in a bowl set over barely warm water, stirring occasionally.

Notes

If the sauce breaks (looks oily/grainy): Add 1 tablespoon of cold water or an ice cube and whisk vigorously. This often rescues it.
If the sauce gets too thick/cold: Add 1-2 tablespoons of hot water or warm fish stock and whisk over gentle heat.
Variations (non-traditional but common): Adding 1-2 tablespoons of heavy cream to the reduction before the butter makes the emulsion much more stable. This is a restaurant trick, not the traditional method.
Serving: Traditional pairing is poached river fish (pike, zander, perch). Excellent with any white fish, salmon, scallops, asparagus, or poached eggs.
Wine choice: Muscadet (Melon de Bourgogne) is the classic Loire pairing. Dry Sauvignon Blanc, Chablis, or dry Vermouth also work. Avoid anything oaky or sweet.