Chocolate without Calories

I found this at our garden centre this week, and just couldn't resist buying it!
It does smell a little like chocolate, yes, and the leaves have a chocolatey tinge to them. But if this mint is anything like the usual varieties, it will be very, very easy to grow more! I think I may have found a new business interest! Orders welcome!
Or perhaps just a little money-making for our village fete next month!