Prepare a 20 x 20cm (8 x 8") ganache frame or baking pan with a removable bottom, by lining the former with acetate sheet or parchment paper and the latter with plastic wrap. Set aside.
Add the coconut oil to a small bowl or measuring cup and heat to melt. Stir in the citrus oil and allow to cool to 31C. (My sous vide comes in handy, as it keeps the oil and my chocolate at required temperature, until I am ready to use them.)
Melt the chocolate and stir in the oil mixture, until well combined. Temper and pour into the prepared pan and allow to set. The length of time it takes to set will be dependent on the conditions in your kitchen/home. You can pop it in the refrigerator to set, but you will want to ensure it doesn't set too hard, if you plan to use a guitar (confectionery cutter).
Toss the squares in cocoa powder to lightly coat. Enjoy!