What is a masonic fire?

Masonic fire is a ceremonial form of salutation or rhythmic applause executed by brethren during the drinking of toasts at the festive board following a lodge meeting.

The custom, along with associated traditions such as the Tyler's toast, has its origins in the historical Masonic Lectures, as the United Grand Lodge of England notes. The history and study of the practice remain subjects of Masonic scholarship, with papers and audio lectures dedicated to it preserved in the archives of Quatuor Coronati Lodge.

Because the practice derives from the Masonic Lectures, the United Grand Lodge of England's Board of General Purposes recommends that fire should not be rendered in the presence of non-Masons when Masonic toasts are drunk.