Back to: Cooking & Food Science
The single most important piece of food science for a home cook is the Maillard reaction: the cascade of chemical reactions between amino acids and sugars that occurs when food surfaces get hot, roughly 140–165°C (285–330°F) and up, creating browning and hundreds of new flavor and aroma compounds. Seared steak crust, toasted bread, roasted coffee, golden roasted vegetables, the crispy edge of a smash burger: all Maillard. It is quite literally the flavor of ‘cooked.’
Because Maillard needs high surface temperature, its great enemy is water, which caps surface temperature at 100°C (212°F) until it evaporates. This one fact explains a dozen kitchen rules: pat meat dry before searing; don’t crowd the pan (crowding traps steam, and food boils grayly in its own moisture instead of browning); roast vegetables hot, around 220°C (425°F), with space between them; get the pan properly hot before food touches it. When browning isn’t happening, the answer is almost always ‘too wet, too crowded, or too cool.’
Maillard’s cousin, caramelization, is the browning of sugars themselves at slightly higher temperatures, think deeply browned onions or the top of a crème brûlée. Both build savory depth, which is why so many recipes begin ‘brown the meat’ or ‘cook the onions until golden’: those steps are flavor manufacturing, and rushing them is the most common way home cooks quietly cap how good a dish can be.