Since I am using the electric pot, I first set the function setting to "high". Later on, I switch it to "low" when simmering.
Turn on the stove and pour water into the pot.
Bring the water to a boil.
Drop in the bouillon cube. I usually crush this to make it dissolve faster.
Add light and dark soy sauces and mirin. Stir.
Lower the temperature to medium-low heat.
Add seafood and mushrooms. Simmer for about 2-3 minutes
(Optional) Add the mushrooms. Stir.
(Optional) Add cabbage. Do not stir. Push down the leaves so all is submerged and can cook evenly.
Add noodles. Continue simmer at medium heat.
Add salt and pepper to taste.
Turn off heat after 3 minutes. At this point noodles are only halfway cooked. Noodles will continue cooking from the residual heat.
When noodles have absorbed sufficient water, add sesame oil. Stir.
Serve into bowls, and top with chopped chives.