A Vietnamese Dog Roll (VDR) is a cheap and cheerful delicacy typically served out of some independent bakeries, lunch bars or specialty shops.
The proper VDR consists of a roughly 6-8 inch baguette, filled with Roast Pork with crackling skin (or chicken, or both), Pickled Carrot, Cucumber and Cilantro (Coriander) Variants may include other ingredients, pate, butter, lettuce, onion, etc however the addition of some of these other ingredients may upset some 'purists.'
The origin of the term VDR is unknown however one theory is the Vietnamese Rolls are the answer to the western Hot Dog in the shape of the baguette, the fact it uses warm meat in the middle, the price and the ease of availability supports this.
Person A: "I got a fever, and the only prescription is more dog rolls!"
Person B: "GET THIS MAN A VDR STAT"