At the Wattana Panich restaurant in Bangkok, Thailand, you can eat soup has been cooking for 45 years.
The family owned restaurant is locally famous for its beef stew. It's cooked in a big pot, which you can see above. At the end of the night, the staff drains the broth out of the pot and uses it to cook stew the next day. In the morning, the broth is mixed with stewed beef, sliced raw beef, meatballs, tripe, and unnamed organs. The prep time is over four decades.
Do you see the shiny ring around the pot? That's soup residue which has been collecting and solidifying for 45 years. It's formed a basin around the pot.
You can watch a brief documentary by Great Big Story about the restaurant and its famous stew on Vimeo.
-via Nag on the Lake