If the food under a dome is a single item, consisting of food and the packaging it is placed in, and it is ready for presentation to the consumer, then this is PPDS food.
If the dome is removed before the food is presented to the consumer then this is not PPDS, this is non-prepacked food.
As an example, a sushi dish covered with a protective dome that is presented to the consumer with the dome on is PPDS food.
Where a large cake is under a dome and the intention is to slice it into individual portions and serve on a separate plates, this would not be PPDS as the large cake and the packaging it was stored in is not a ‘single item’. This is non-prepacked food.