I remember there was once a huge Black Thunder chocolate craze in Taiwan. It was often sold out, and even a single pack was hard to find. Later, on a trip to Japan, I happened to see it at a convenience store and bought one to try. Honestly, I don't really like overly sweet chocolate to begin with, and after trying it that one time, I thought it was a little too sweet, so I didn't particularly get hooked. But I've heard that this chocolate cookie has remained very popular and widely recognized in Japan.
If you've never tried it, or if you want to relive the craze from back then, you might want to pick one up and give it a try when you visit Japan.
