Browned Food Gets Its Flavor From Heat
Think about the smell of toast, roasted potatoes, or a pancake as it turns golden in a pan. Now think about a boiled potato. It is soft and tasty, but it is pale and has a much milder smell. Why does browned food seem to have so much more flavor?
The answer is a change that cooks call browning. When food gets hot enough, sugars and proteins on its surface react with each other. The reaction makes hundreds of new flavor and smell molecules, and it also turns the surface brown. It is named for a scientist who studied it long ago, Louis Camille Maillard, and people often call it the Maillard reaction.
Browning needs a lot of heat, hotter than boiling water can ever get. That causes a trouble for cooks. A wet piece of food stays cool while its water bubbles away, so it steams instead of browning. The solution is to get the surface dry. Cooks pat meat with a towel before they put it in the pan. They also leave space between pieces of food, so the steam can escape instead of making everything damp.
Browning takes place in many kitchens every day. It gives bread its crust, helps coffee beans develop flavor when they are roasted, and makes a seared vegetable taste rich. When food turns golden brown, the cook knows that a lot of flavor has arrived.