Dark Chocolate & Orange Biscuits

I genuinely wonder how these would fair with coffee - I don't drink it myself.  These would be amazing at the end of a meal with a glass of port.  This I know as there was a little excessive quality control testing on my part with these.  As always when dealing with chocolate get the best quality chocolate and cocoa you can.  Drinking Chococolate is not a suitable substitute in this recipe

Ingredients:
50g Plain Flour
25g Cocoa (I used Green & Blacks)
1 orange
50g Butter
25g Sugar
25g Dark Chocolate

Method:

1. Using a sharp paring knife peel a piece of orange rind from the top of the orange to the base being careful to take as little of the pith (the white part under the skin) with you. On a cutting board shred that into fine slivers.  Grate the remainder of the rind on the finest part of the grater again being careful to avoid the pith.
2. Cream butter and sugar and add orange zest and slivers.
3. Sieve Cocoa and Flour together to blend and remove lumps.  Add two thirds to the butter sugar mix in batches and mix well.
4. Chop Dark Chocolate quite fine (these biscuits will be rolled out quite thinly) add to the remaining flour before adding whole lot into the biscuit dough and mixing well
5. Form a large ball with the dough, wrap it in cling film and chill in the fridge for 30 mins
6. Preheat the oven to 190C
7. Roll out thinly and cut with a glass or cookie cutters.  Bake on a baking sheet in the oven for 10mins.
8. Allow to cool on the baking sheet for 5 mins before transferring them to a cooling rack.