The classic Vietnamese
spring roll is composed of:
tree ear mushrooms
The above ingredients are mixed in a bowl. Use your judgement
w.r.t. proportions. Rice papers are soaked in lukewarm
water for several minutes to soften. Dry off the excess moisture from a rice paper, and lay on a towel. Spoon 1 tablespoon of the mixture into the end of the rice paper. Roll 1/2 way up, fold the sides against the now-encapsulated mixture, and roll the rest of the way. Press the roll together to seal. Storing the roll in the fridge for several hours will help the rolls to not explode when cooked.
Cook in canola oil (at least that's what I use;I've heard peanut oil is nice, but is very expensive) at 375 deg. F. Prevent newly-placed rolls from sticking to each other for the first minute or so in the hot oil. Cook until golden-brown.
Slice each roll into 1" thick sections, and serve with nuoc cham, lettuce, and mint. Place a piece of the roll into a piece of lettuce, with a mint leaf. Dunk into the nuoc cham. Enjoy.