Leave it to the Japanese! This unusual flavor is sold in Japan. It is called Black Garlic Chocolate. It is fermented black garlic covered in chocolate sprinkled with cocoa.
This product was released in Japan just in time for Valentines day last year. Takko Shoji, a Japanese company, produces this product. Three chocolates as displayed in this picture can be purchased for only 600 Yen (~$6.50). Now, I cannot read the website so I don't know if I can order them for delivery here in the US, but I am sending an email to my Japanese friend who actually lives in Australia to help me answer this question. Now some of you may be thinking, why garlic on Valentines day? That does not seem very romantic. Don't worry the Takko Shoji spokesperson had something to say about that, "If both people eat them, there'll be no problem."
I have no nutritional information about this product.
Nutrition from the dietitian
Blog of Abrea Nutrition.