Melt your chocolate either in the microwave or in a Pyrex bowl over a pan of hot water.
Whilst the chocolate is melting line the moulds of a fairy cake tray.
Once melted, place about two tablespoons of dark chocolate into each fairy case.
Give the tray a little shake to get any air bubbles to the surface, then sprinkle strawberries and walnuts (if using) on top as you wish.
Leave to cool in the fridge for a couple of hours and serve!