Hollandaise sauce is an emulsion of egg yolk and butter, usually seasoned with lemon juice, salt, and a little white pepper or cayenne pepper. In appearance it is light yellow and opaque, smooth and creamy. The flavor is rich and buttery, with a mild tang added by the seasonings, yet not so strong as to overpower mildly-flavored foods.
Hollandaise is one[1] of the five sauces in the French haute cuisine mother sauce repertoire. It is so named because it was believed to have mimicked a Dutch sauce for the state visit to France of the King of the Netherlands. Hollandaise sauce is well known as a key ingredient of Eggs Benedict, and is often paired with vegetables such as steamed asparagus.
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As early as 1651, François Pierre La Varenne describes a sauce similar to Hollandaise sauce in his groundbreaking cookbook Le Cuisinier François: "avec du bon beurre frais, un peu de vinaigre, sel et muscade, et un jaune d’œuf pour lier la sauce" ("with good fresh butter, a little vinegar, salt, and nutmeg, and an egg yolk to bind the sauce"). Alan Davidson notes a "sauce à la hollandoise" from François Marin's Les Dons de Comus (1758), but since that sauce included flour, bouillon, and herbs, and omitted egg yolks, it may not be related to the modern hollandaise.[2] However, Larousse Gastronomique states that, in former times fish 'à la hollandaise' was served with melted butter (implying that at one time egg yolks were not a part of the designation).[3] Davidson also quotes from Harold McGee (1990), who explains that eggs are not needed at all and proper emulsification can simply be done with butter. He also states that if one does wish to use eggs they are not needed in as great a quantity as normally called for in traditional recipes.
The sauce using egg yolks and butter appeared in the 19th century. Though various sources say it was first known as "sauce Isigny" (a town in Normandy said to have been renowned for the quality of its butter), Mrs. Isabella Beeton's Household Management had recipes in the first edition (1861) for "Dutch sauce, for fish" (p. 405) and its variant on the following page, "Green sauce, or Hollandaise verte". Her directions for hollandaise seem somewhat fearless:
Hollandaise requires some skill and knowledge to prepare and hold. Properly made, it will be smooth and creamy with no hint of separated oil. The flavor will be rich and buttery, with a mild tang. It must be prepared and served warm, but not hot.
There are a number of different methods for preparing a Hollandaise sauce. All methods require near-constant agitation, usually with a wire whisk.
One family of methods involves acidifying the egg yolks to aid in the formation of an emulsion. Escoffier[4] uses a reduction of vinegar and water. Others[5][6] use lemon juice or sherry.[7] The acidified yolks are whisked gently over simmering water[8] until they thicken and lighten in color (144 °F/62 °C). Then, like a mayonnaise,[9] the emulsion is formed by very slowly whisking in melted butter. (Clarified butter is preferred.) Some varieties of this preparation use water of various quantities and temperatures.[10]
Alton Brown espouses quite a different method.[11] The yolks, without acid, are cooked as above. Then the upper pan is removed from heat and cold cubed butter (unclarified) is whisked in, a few cubes at a time. The emulsion forms as the cubes melt. The pan is returned to heat only when the emulsion cools too much to melt more cubes. Lemon is used as a finishing flavor. This method takes more time than traditional methods, but is more reliable in that it is difficult to overheat the forming emulsion.[12]
The above methods are known as "bain marie methods". Another family of methods uses a blender.[13][14] Yolks are placed in a blender, then butter - at a temperature higher than appropriate for bain marie methods - is drizzled into the blender. Heat from the butter cooks the yolks. Blender methods are much quicker, though temperature control is difficult. The products of blender methods may be acceptable, but are generally considered to be inferior to the products of bain marie methods.
Joy of Cooking[15] describes a preparation unlike all the above, using whole eggs, and slowly adding the egg mixture to melted butter over direct heat. It also includes variations incorporating sour cream and paprika, or cream and nutmeg.[16]
Note that in all methods the temperature must be closely controlled. Too much heat and yolks will curdle (180 °F/82 °C) or an emulsion break (separate).[17] Too little heat and an emulsion will fail to form, or (once formed) will solidify.[17] Once the yolks are prepared, the sauce should be not much warmer than required to maintain the butter in a liquid state, that is, a little warmer than body temperature. Be sure to consider both the temperature of the yolks/emulsion and that of the melted butter. A finished sauce can be "held" in its emulsified state for several hours by keeping it warm. Success with freezing Hollandaise has been reported;[18][19] it is not widely practiced.
A normal ratio of ingredients is 1 egg yolk : 4-6 Tbs. butter. Flavorings may include salt, lemon juice,[20] and cayenne pepper or white pepper.
Being a mother sauce, Hollandaise sauce is the foundation for many derivatives created by adding or changing ingredients. The following is a non-exhaustive listing of such minor sauces.
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