According to CNN, some street food vendors in one neighborhood in China are making their steamed buns out of, among other things, cardboard:

Chopped cardboard, softened with an industrial chemical and flavored with fatty pork and powdered seasoning, is a main ingredient in batches of steamed buns sold in one Beijing neighborhood, state television said.

Gives whole new meaning to the "tastes like cardboard" comment we all often use in describing food we don't like. Someone here at Serious Eats world headquarters says that this proves beyond a shadow of a doubt that pork really does make anything taste better.