Salt, Fat, Acid, Heat: Mastering the Elements of Good Cooking
Nosrat, Samin
Page 177 covers the tail end of a butter sauce technique and then introduces the concept of breaking and fixing emulsions. It briefly shows how the same butter-swirling method applies to pasta sauces, citing Pasta Cacio e Pepe as an example, then explains that emulsions break most commonly due to temperature swings, with each emulsion having its own required temperature zone.
- Butter-water sauces for pasta work the same way as pan sauces: cold butter, hot pan, enough water, constant swirling.
- Pasta Cacio e Pepe (pecorino + black pepper) is offered as a direct application of this technique.
- Emulsions break most often when temperature swings outside their comfort zone — not just from combining fat and water too quickly.
- Different emulsions require different temperature conditions: vinaigrettes break if heated, beurre blanc breaks if chilled.