Rinse the dried seaweed in cold water to remove any salt or impurities. Soak the seaweed in water for 10-15 minutes until it softens. It helps to remove any salt or impurities. Drain and set aside.
Place the dried seaweed, dried shrimp, sesame oil, chopped cilantro, green onion slices, salt, and pepper in a deep bowl.
Bring the chicken stock(or water) to boil over medium heat in a pot. Slowly pour the whisked egg into the pot. Once the lovely "yellow ribbons" firm up, turn off the heat immediately.
Pour the liquid mixture into the bowl over all the ingredients.
Mix the soup well to allow the flavors to blend.
Serve the Chinese seaweed soup hot. Season the soup with soy sauce. (optional)