I first learned about Yuraku's Black Thunder Bar when I reviewed the Yuraku x Tirol in May of this year (2012).
This bar strikes me as a kind of mix-up of an Oreo, Malteasers and some chocolate all mixed together and made into a slab. It is called Black Thunder for one reason, it literally is black inside, with little bits of white biscuit pieces scattered through it.
Biting into it is like being in heaven, if you're a cookie lover like I am. It's so crunchy, and it's like eating crushed chocolate biscuits coated with chocolate. The biscuit inside is so chocolatey and rich. There is a strong hit of cocoa with every mouthful.
I'm really surprised this exists in the Japanese market because they are not really known for their strong, slap-you-in-the-face flavours, they seem to prefer more subtle tastes. This is a chocolate bar that says HELLO! when you eat it.
The only downside is it's quite crumbly and breaks easily.
This is a very simple bar...it's just chocolate on chocolate, there are no other flavours. So if you're a chocolate fan then you'll love this. It's the perfect size really, because it's so rich. You wouldn't want any more than this 22 gram pack at one time.
Have a look at the Yuraku website here.