Soak the bean thread noodles and wood ear mushrooms in boiling water until softened, about 1 minute. Drain well. Chop the bean thread noodles into ½ inch pieces and mince the mushrooms.
Peel and shred the jicama. Add it to a cloth towel and wring out as much moisture as you can. Do the same for the carrot. Then shred the taro, but don't wring it out. Chop the ends off of the scallions and finely chop them.
Use your hands to squish the shrimp until its flesh bursts. Mince the shrimp finely, until it resembles a course paste.
In a large bowl, add the ground pork, minced shrimp, chopped mushrooms and bead thread noodles, chopped scallions, shredded taro, carrot and jicama, minced shallot and garlic, sugar, black pepper, sesame oil, salt, fish sauce and corn starch. Add the msg if you're using it.
Mix all of the ingredients together. It's easiest to do this with your hands, so you can feel how well the ingredients have incorporated.
Take a bite-sized amount of the filling and microwave it for 10-15 seconds until it's fully cooked. Taste it, and season with more salt, pepper, sugar or fish sauce to taste. These shouldn't be overly salty, because you will dip them in fish sauce dipping sauce or sweet chili sauce.
Beat one egg and set it aside to seal the egg rolls.