Spread a thin layer of tempered white chocolate onto a marble or granite slab using a step palette knife and leave to semi-set. Using a comb scraper, drag vertically down, creating stripes. (1)
On top of the white chocolate stripes spread a thin layer of dark chocolate to fill the newly made gaps and leave to semi-set. (2)
Using a metal scraper, push at an angle against the layer of chocolate to create thin cigar shapes (copeaux) (3) - a short sharp movement to the side will cause the two-tone copeaux to stay on the marble. Leave the two-tone copeaux to set on the surface for a few minutes, then remove with the metal scraper.