According to Vancouver Is Awesome, the London fog tea latte was created by a Vancouver resident in the 1990s. If you assumed the beverage originated in London given its name, you wouldn't be the first person to follow this line of thinking. Apparently, no one knows why the Earl Grey latte was given the "London fog" moniker, not even the woman who came up with the idea in the first place (per Simply Scratch).
In the mid-1990s, a woman named Mary Loria was living in Vancouver near The Buckwheat Cafe. Loria would frequent the cafe with her husband as it was known for its quality coffee and pastries, but when Loria became pregnant she knew she had to find a less caffeinated drink to consume during their visits. "There was this young woman who worked there, she was awesome and we got to know her over time we got there," Loria recalled to Vancouver Is Awesome. "I asked her to make me an Earl Grey tea, but with skim milk."
Loria would then mix in vanilla sugar once the drink was prepared for her, and she enjoyed the tea latte so much that she decided to tell everyone she knew to order the drink at their local cafes. The London fog grew in popularity from there, eventually picking up its name from an unknown individual along the way, per Grow Tea Go. Now, the drink can be ordered at Starbucks locations across the world.
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