Soak vermicelli in warm water (immerse completely) for 30 minutes. Drain well and cut into 0.5cm pieces.
50 g rice vermicelli (or mung beans) dry weight
Rehydrate the mushrooms. You might have too much, you can freeze the surplus
30 g wood ear mushrooms
In a large bowl, combine noodles, ground chicken, grated carrot, black mushrooms, shallots, garlic, egg white, ginger, fish sauce, vegetable oil, salt, white pepper and sugar. Blend until evenly combined.
450 g boneless chicken thighs, 190 g carrots, 30 g shallots, 1 clove garlic, 1 teaspoon ginger, 1 egg white, 1 tablespoon of fish sauce, 1 tablespoon neutral vegetable oil, 1.5 teaspoon salt, 1 pinch white pepper, 1 teaspoons of sugar
To fold the egg rolls
In a large shallow bowl or soup plate, dissolve the remaining sugar in 1 glass warm water. The sugar is optional, but will help the egg rolls brown when fried.
2 teaspoons of sugar, 250 ml of lukewarm water
To wrap each roll, place a sheet of rice paper in the sugar water for about 5 to 10 seconds, making sure it's completely submerged. Remove it from the water. It will still be quite firm, but it will soften quickly!
20 dried rice paper (bánh tráng)
Place around 40 g of log-shaped filling on one side of the dough. Start folding the wrapper firmly over the filling (no air bubbles!) and roll the nem forward one full turn. Press lightly on each end of the filling to flatten the rice paper, and push the filling together to eliminate any air bubbles.
Fold one side of the wrapping towards the middle of the spring roll. Repeat with the other side. Roll the spring roll forward, tucking it in at the front to avoid air pockets. The rice paper will stick to itself. Nothing more is needed to seal them. Place the rolls on a plate or tray lined with a clean, dry kitchen towel or parchment paper.
Cooling
Once wrapped, transfer the egg rolls to the refrigerator and chill for at least 1 hour, to allow them to dry and firm up. This step helps to minimize bubbling of the packaging during frying (although slight bubbling is normal). Take them out of the fridge 15 minutes before frying.
Cooking egg rolls
Heat about 1L of frying oil in a medium saucepan to 170°C (the oil level should be slightly above halfway up the sides). Fry the spring rolls in small batches, about three at a time. Make sure they don't touch immediately after being placed in the oil, as the skins will be sticky until a crust forms. Fry each batch for 5 to 6 minutes, or until lightly browned (frying them in small batches prevents them from sticking together).
Vegetable oil
Use a metal skimmer to remove them from the oil. Drain on a wire rack and continue cooking. Maintain the right oil temperature by periodically adjusting your griddle.
Just before serving, deep-fry the egg rolls (yes, they need to be double-fried) at 175°C for 1.5 to 2 minutes, until golden and crisp. Double-frying is very, very important!
Serve with fresh lettuce, coriander, Thai basil, mint and nuoc cham for dipping.
Lettuce, Thai basil, corriander, Nuoc cham sauce
Notes
The recipe calls for 20 spring rolls, so I count about 2 rolls per person. You will have about 800 g of filling in total, so each of your 20 spring rolls should have about 40 g of filling. When cooking, if the nems stick together, don't try to separate them or touch them - they will come apart on their own.Thanks to Andre Souppaya, member of the site's official Facebook group, for the ultra-fast egg roll folding technique video.