Just made some Kendal Mint Cake based upon this recipe:

Kendal Mint Cake Recipe

Ingredients
1lb sugar (white, for white mintcake, brown for brown mintcake!)
1/4 pint milk
1 teaspoon of peppermint essence
Optional: melted chocolate (just in case you want to coat the finished product)

I used brown sugar and added dark chocolate. Came out okay, not as good as the real thing, a little on the thin side. I am going to try another larger batch with white sugar and no chocolate.

Pete