The cake above is from this website and I was wondering how the swirl effect is done on top of the cake? At first, I thought it may be done using a similar method to latte art, but am really unsure. Is it just a cocktail stick pulled through the icing in a curve? The bit that confused me most was how there was milk chocolate in the white chocolate half and white chocolate in the milk chocolate half for the same swirl.
The cake in the image below (which is from the same website) seems to have used a similar technique: