Clean and debeard the mussels. Soak in cold water for 20 minutes and drain. Please use fresh mussels for this recipe!
Cut the peppers and scallions into 1/4 inch thick slices.
In a pot, add water, onion, dried kelp, and thai chili peppers. Bring to a boil and cook for 20 minutes. Strain and bring to a boil again.
Add the mussels, peppers and scallions. Cook until the mussels have opened. Transfer the opened mussels to a bowl.
Mussels release some salt during the cooking process so taste the soup first before adding the seasoning. Add all the salt, white pepper, anchovy powder, and msg.
Pour the soup over the mussels and serve immediately!