Heat sufficient water in 2 deep non-stick pans.
Put dark chocolate in a glass bowl and keep over one pan and the white chocolate in another glass bowl and keep over the second pan.
Let them melt, stirring continuously.
When they have melted take them off the pan and whisk till smooth. Keep a silicon sheet on a tray.
Hold a few strawberries at the top, dip in dark chocolate and hold upside down for 5 seconds and then keep on the silicon sheet.
Similarly dip a few strawberries in white chocolate, hold upside down for 5 seconds and then keep on the silicon sheet.
Take 2 small square pieces of butter paper and shape into 2 icing cones.
Put some melted dark chocolate in one and some melted white chocolate in the other.
Fold the open ends of the cones and squeeze out thin lines on the strawberries – dark chocolate lines on strawberries dipped in white chocolate and white chocolate lines on strawberries dipped in dark chocolate.
Chill and serve.