Question: What were Snowpiercer's protein blocks (the food of the tail section) really made of on set?
Bong Joon-Ho: Actually, it was made out of a combination of sugar and seaweed, the results were not a very tasty one, to create that jelly-like feeling we had to use this combination. And the actors, Chris and Octavia and Tilda, had to actually eat them on-set, they were edible but tasted terrible. Have you ever been to Japan or Korea? they have a tasty dessert called Yanggaeng that is a tasty dessert, so when the audiences in those countries saw the protein block they had a very different reaction.