Sugar caramelizes when heated past its melting point, producing hundreds of new flavor compounds.

The longer version

Heated far beyond the point where it merely melts, sucrose molecules begin to break apart and recombine. Water is driven off, fragments of sugar react with one another, and the mixture darkens as large colored molecules accumulate. Alongside the color come many volatile compounds responsible for the nutty, toasty, and slightly bitter notes associated with caramel.

Because the reactions accelerate as temperature rises, the line between pleasant and burnt is narrow. Acid or the presence of other sugars shifts both the speed and the flavor profile, which is why caramel made from different starting materials tastes noticeably different. Even slight overcooking turns the sugars harsh and dark.

Where this entry sits

Everyday ingredients turn out to be full of quiet chemistry and long history. This collection gathers short, plain explanations of how bread rises, why onions sting, where common spices originate, and how coffee, tea, and chocolate reached the modern kitchen. The full list sits on the Food and Drink page, where every entry is listed in order.