Brown butter: browning the milk solids

Useful to know

Brown butter develops when its milk solids toast, changing the flavour. King Arthur describes nutty, toasted notes and the need to watch the process. This is different from simply melting solid butter. [1]

Observe the solids and colour rather than relying only on elapsed time. The recipe may require cooling before the butter is added. If replacing ordinary butter, choose a tested adaptation: water loss and the fat’s condition can change the mixture. Brown butter is not a universal substitution that leaves every step unchanged.