This is the most clever thing I've seen posted on this site in a while. This was in 2008 and they said it would be sold within two years, so I assume that it wasn't a successful product? Or at least never made it to the West?
The vast majority of “wasabi” is horseradish and food coloring.
Plants yield a mixture of cannabinoids at some concentration, which constitute ~10% of the dried plant matter. These can be extracted and separated with various techniques. The effects of pure THC are different than that of the mixture.
Upcoming schemes use engineered micro-organisms to produce specific cannabinoids, efficiency of the systems is ramping up. My understanding is that the synthesis of cannabinoids is is quite an inefficient way of manufacture.
None the less, it's all the same - covalently bound atoms :)