Dice onion and microwave for 1 minute.
Dice tofu and fry until browned.
When tofu is browned, add bok choy and sauté until wilted.
Boil 4 cups of water in a medium pot and 1 ¼ cups in a separate small pot.
Add defrosted noodles to the 4 cups of boiling water. Cook 1 minute 15 seconds, stirring occasionally (if frozen, add 1 minute to cooking time).
Open soup base packet and pour into a soup bowl. Add the 1 ¼ cups of boiling water to the soup base and mix well.
Drain cooked noodles and add to soup.
Place diced onion, diced tofu and bok choy on the top. Drizzle with yuzu oil.