The rice batter is steamed in a single thin sheet stretched over cloth on a pot of boiling water, then peeled off whole in seconds — a technique closer to crepe-making than anything else in Vietnamese cooking.
A thin, near-translucent sheet of steamed rice batter is filled with minced pork and wood-ear mushroom, rolled, and topped with crispy fried shallots, served with slices of Vietnamese sausage and a light fish-sauce dip. Hanoi vendors often steam the batter to order, peeling each sheet straight off the cloth before rolling it while still warm.