A normal Subway restaurant in Tokyo:
Or IS it?
Well, obviously not. In this Subway, they grow their own hydroponic lettuce for use in the store. They call it “831 Lab“:
As far as I know, this is a special trial only run in a few stores.
The name “831 Lab” is interesting in itself. Numbers in Japanese can be pronounced in various ways. One way you can write 8-3-1 is Ya-San-Ichi, which you could shorten down to get “ya-sa-i”. “Yasai” in Japanese means “vegetable”, so, 831 Lab is the “vegetable lab”.