Rehydrate the vermicelli noodles and wood ear mushrooms for at least 15 minutes.
Take the ground pork and add sugar, fish sauce, salt, black pepper and sesame oil. Mix well and let it marinate for 5 minutes.
Finely chop the green onions, shallots and garlic. Peel and finely cut the carrots. Use a julienned peeler to get a consistent-sized shredded carrot. Add to the ground pork.
Once the vermicelli noodles are rehydrated using scissors cut them into 3-inch lengths. Chop the wood ear mushrooms. If using the salted duck egg cut it into small pieces. Add them to the pork mixture and mix well.
Add the 4 eggs to the pork mixture. Mix it well and pour the cha trung hap mixture into the plate or bowl you will be using to steam in.
Prepare the Instant Pot and add approximately 2 -3 cups of water. I have the 8-quart so I use 3 cups of water. Place the Instant Pot trivet in first and slowly place the plate of cha trung hap. I recommend using aluminum foil to cover the plate to reduce the amount of water that pools on top during the cooking process. Place the lid on top and set the Instant Pot to steamer function for 15 minutes and natural release for 10 minutes.
While the cha trung hap is cooking separate the egg whites from the yolk. For the top, we will only be using the egg yolk. Set aside the egg whites for another recipe.
Once the Instant Pot is done and the lid is ready to be removed. Take the Instant Pot lid off and slowly lift the trivet. Using a spoon or a silicon brush pour the two egg yolks on top and evenly spread it all over.
Place the trivet and plate back into the Instant Pot and cover the Instant Pot with the lid on and set to steamer for 1 minute and release immediately.
Remove the cha trung hap from the Instant Pot and serve with your favorite side dish and rice.