For our wasabi, we start with creamy peanut butter.
We add about twelve drops of green food coloring.
Behold the glory!
Mix well using a counter-clockwise motion (clockwise if you're in the southern hemisphere), else peanut butter/food coloring may catch fire.
Here we've used dark chocolate syrup for soy sauce. Notice how our faux-wasabi is completely indistinguishable from the real thing. Several wasabi experts flown in from Japan committed seppuku after mistaking our wasabi-simulant for the real thing and/or Jabba the Hutt.