Step 1

Melt chocolate, milk and sugar together in a steel bowl over a simmering pot of water (make sure bowl isn't touching water)!

Step 2

Once all above is incorporated and smooth slowly add Guinness, folding with a spatula - don't over mix!

Step 3

Now add in the diced cold butter and vanilla essence stirring slowly till completely smooth and all sugar is dissolved. Finish with the cream and let cool until warm.

Step 4

Toast your marshmallow until golden brown and slide onto your cookie.

Step 5

Add a dollop of the Guinness chocolate sauce, top with another cookie and enjoy!