
Bagna cauda
A warm dip of garlic, anchovy and olive oil, often enriched with butter, that Piedmont serves over a flame with raw and cooked vegetables and bread.
Sauce hollandaise · Hollandaise · Dutch sauce · Bearnaise (derivative) · Sauce Isigny
Hollandaise is a warm emulsion of egg yolk and butter finished with lemon juice, one of the French mother sauces, and the base for Bearnaise and other derived sauces.

Hollandaise is a warm emulsion of beaten egg yolk and butter, finished with lemon juice. Escoffier listed it among the mother sauces. It is the base for bearnaise and many other derived sauces.
The lecithin in the yolk is the emulsifier, so the sauce does not set like a custard. It thickens because the yolk and butter are held together gently, and it can be broken by too much heat.
The first documented recipe is in La Varenne's 1651 book, in a dish of asparagus with a fragrant sauce. The name is said to mean Dutch sauce, from the Franco-Dutch War, but the article gives this without full certainty.
Prosper Montagne suggested a reduction of wine or vinegar to improve the flavour. A later name, sauce Isigny, points to the butter of Isigny-sur-Mer.
Beaten egg yolks are combined with butter, lemon juice, salt and water, then heated gently over a double boiler while whisked. Methods vary: melted butter may be poured into warm yolks, unmelted butter may be heated with the yolks, or a blender or food processor may be used. The yolks in this version are only gently heated to form and warm the emulsion; no pathogen-reduction endpoint is specified. Use pasteurized eggs or pasteurized egg products for this low-heat preparation.
Some cooks reduce vinegar, water and cracked peppercorns until nearly dry and add the strained reduction. Temperature control is the main risk: the article says excessive heat can curdle the sauce, and it gives no rescue method.
Bearnaise is the most common derivative. Its name comes from the province of Bearn. According to a common explanation, the chef Jean-Louis-Francois Collinet invented it by accident and served it at the 1836 opening of Le Pavillon Henri IV at Saint-Germain-en-Laye. The article presents this as a common explanation, not a confirmed fact.
Bearnaise is finished with a reduction of wine or vinegar, shallot, chervil, tarragon and crushed peppercorns, strained and whisked into yolk and clarified butter at about 66 C (150 F) over a bain-marie. Choron adds tomato puree, Foyot adds meat glaze, Colbert adds reduced white wine, and paloise uses mint. Maltaise uses orange, mousseline folds in whipped cream, and noisette uses browned butter.
The article states only that hollandaise can be frozen. It gives no holding times, no reheating advice and no food-safety statement beyond the temperature control needed during preparation.
USDA FSIS identifies hollandaise among foods that can contain raw or undercooked eggs and advises against unpasteurized eggs. FDA guidance recommends pasteurized eggs or egg products for hollandaise. This page's gentle heating is for texture, not a measured safety step. No validated warm-holding or storage time is established here.
The name is said to mean Dutch sauce and to date from the Franco-Dutch War; the article cites this without full certainty. La Varenne may have invented the sauce, a claim the article presents with hedged wording. A later name, sauce Isigny, refers to Isigny-sur-Mer, known for its butter.
Scaling: source batch only
Hollandaise may contain undercooked egg. USDA FSIS specifically lists hollandaise among foods containing raw or undercooked eggs and advises against unpasteurized eggs.
Hazard sourceUse pasteurized shell eggs or pasteurized egg products for hollandaise. The gentle heating described here is for texture and has no documented time-and-temperature pathogen-reduction limit.
Control sourceThis low-heat method does not establish a pathogen-kill endpoint. Use pasteurized eggs or pasteurized egg products; USDA FSIS advises against eating hollandaise made with unpasteurized eggs.
No validated warm-holding or storage duration is provided here. Serve promptly and use a tested method for holding or storage.
The first documented recipe is in La Varenne's 1651 cookbook; the name's Dutch link is uncertain.
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WikipediaHistory · Method
Hollandaise sauceLa Varenne 1651; Dutch-sauce name uncertain; Isigny; Escoffier; double boiler; curdling; derivatives; freezing only
Cited in: An egg-yolk emulsion; Origins and the name; Making the emulsion; Bearnaise and the derived sauces; Holding and freezing
WikipediaHistory · Method · Variants
Bearnaise sauceCollinet 1836 common explanation; Bearn name; Escoffier method; 66 C bain-marie; Choron, Foyot, Colbert, paloise; no storage advice
Cited in: Bearnaise and the derived sauces
United States Department of Agriculture, Food Safety and Inspection ServiceSafety
Who is at risk for eating raw or undercooked eggs?FSIS specifically lists hollandaise sauce among foods that may contain raw or undercooked eggs and advises against eating unpasteurized eggs.
FSIS says pasteurized in-shell eggs may be used safely without cooking.
Cited in: Making the emulsion; Holding and freezing
U.S. Food and Drug AdministrationSafety
Assuring the Safety of Eggs and Menu and Deli Items Made From Raw, Shell EggsFDA recommends substituting pasteurized eggs or egg products for raw shell eggs in hollandaise and béarnaise sauce.
This recipe's gentle warming method does not state a measured time-and-temperature safety endpoint.
Cited in: Making the emulsion; Holding and freezing