Real wasabi, Wasabia japonica, is apparently one of the most expensive vegetables to grow. That green stuff you're eating? Ground horseradish, Chinese mustard, and, you guessed it, green food coloring. Yum.
According to The Atlantic, "Worldwide, experts believe that this imposter combination masquerades as wasabi about 99% of the time."
Above, meet Shigeo Iida, 75, whose family has grown real wasabi for eight generations.