Many London Fog lovers think the drink is named for the cloudy look that forms when warm milk is added to Earl Grey tea.

Corton also discusses the book that Peter Ackroyd has called “the greatest novel of London fog,” Robert Louis Stevenson’s “The Strange Case of Dr. Jekyll and Mr. Hyde” (1886).

The London fog, with its confusing name and its understated but sophisticated flavor profile, seems well-poised to make a newfound mark on international café culture.

Sometimes referred to as a London Fog, Earl Grey latte or tea latte, the formula is pretty simple: Earl Grey tea, steamed/frothed milk and flavorings, usually in the form of a syrup.

She also discusses — all too briefly — the book that Peter Ackroyd has called "the greatest novel of London fog," Robert Louis Stevenson's "The Strange Case of Dr. Jekyll and Mr. Hyde" (1886).