If you go back to Trujillo from Huanchaco beach, you'll find a place on the road where eat some typical food... These aren't donnouts but maybe they have a similar shape, these are called "picarones", which is a sweet, ring-shaped fritter with a pumpkin base; often served with a molasses syrup. Picarones are very popular and it's no easy to get this shape to cook them. 
