Hollandaise Sauce

Sauce hollandaise (warm butter-and-yolk emulsion) teaches one true thing: temperature makes the sauce, and temperature can undo it. The yolks must become warm enough to hold the butter, never hot enough to scramble; the butter must flow, never arrive so hot or fast that the emulsion loses its footing. C'est la même grammaire across the whole family of warm emulsions.

The source formula made a quart and assumed a saucier stationed beside a gentle corner of the range, with a bain-marie ready and a tammy waiting for the final polish. For one cook, one stove, one evening, the formula becomes one-third its original size: two yolks, eight ounces of butter, and every other quantity reduced in the same proportion. A heatproof bowl over barely simmering water supplies the bain-marie, a warm-water bath, while a fine-mesh sieve replaces the tammy. Sieving is brigade scaffolding and may go when the sauce is already perfectly smooth; the vinegar reduction, properly cooked yolks, and gradual mounting of the butter are the dish itself and must stay.

When hollandaise is right, it falls from the whisk in pale butter-gold ribbons, glossy but not greasy, with vinegar underneath and lemon arriving at the finish. Begin the butter drop by drop. Those first few additions matter most because they establish the emulsion that carries everything afterward.