Fat and Emulsification
The three roles of fat, and the temperature windows of emulsion
After this chapter, the moment your hollandaise breaks, your pesto goes oily, your pasta sauce slides off the noodles, or your stew tastes thin even though there's butter in it — you'll know which of three jobs the fat was failing at, and which lever to pull next.
The three roles of fat
The chapter argues that fat does three independent jobs in cooking — and that almost every “broken sauce” problem comes from confusing them. Once you can name which job is failing, the dish becomes diagnosable instead of mysterious.
- 01Carrier — the medium that distributes aroma at the start of cooking
- 02Structural agent — the active partner in an emulsion that holds water and oil
- 03Textural finish — the mouthfeel layer added off the heat, at the end
The chapter also covers emulsion as controlled instability, the five fat families (butter, oils, cream, yolk, nuts + rendered), how different cuisines specialize in different fat jobs, and ten worked examples — from aioli to beurre blanc to cacio e pepe.
Chapter 2, in one PDF.
About 6,000 words, A4 print-friendly. Free, no signup required.
Download the PDF →For the French-specific applied manual on the same material, see The Sauce Notebook. The Atlas chapter is the cross-cuisine general theory; the Sauce Notebook is the French applied detail.