Cha Gio pronounced "chow yau" are Vietnamese spring rolls in the south. It is called and Nem sai gon or Nem ran in the north. Cha Gio are small rice papers filled with minced pork, crab, vermicelli, Moc Nhi, a kind of edible fungus , onion, mushrooms and egss and then fried until the rice paper turns crispy brown. Nem Rau are vegetable spring rolls.