It seems like I was just telling a friend about unagi (Japanese eel) the other day and now I stumble upon this post. Their history section is a little lacking in detail—my favorite anecdote is that before the Edo period, unagi was considered a winter dish, but in the Edo Era due to the marketing of one guy, it both became thought of as a summer food and became quite popular—both otherwise this is a nice overview.

LINK: The Essence Of Unagi: Discovering Japan’s Love For Eel