Soak the seaweed (if using) in water according to the packet instructions, then drain, rinse in fresh water and roughly chop before setting aside. Boil the kettle.
Fill a saucepan with boiling water and cook the noodles according to the packet instructions until al dente (about five minutes instead of the usual six to eight), then drain, rinse with cold water to stop them cooking, and set aside.
Meanwhile, melt the oil in a second, larger saucepan over a medium-high heat. Add the ginger, garlic, chilli and white parts of the spring onions and fry for two minutes, stirring occasionally.
Add the mushrooms and cook for three to four minutes, stirring occasionally, then add the stock and bring to the boil. Reduce to a medium simmer to cook for two minutes and then add the cooked noodles back to the pan to heat through for one minute before removing from the heat.
While the mushrooms are simmering, fill the original pan with boiling water and lower the eggs into the pan. Simmer over a medium heat for six and a half minutes (for a just-runny yolk), then cool the boiled eggs under cold water, peel and halve.
Remove the soup pan from the heat, drop in the shredded cabbage and the soaked seaweed, then mix together the ‘miso stir-in’ in a small bowl and stir through the soup.
Divide the soup among four bowls, add the egg halves and top with the remaining chopped spring onions and a drizzle of toasted sesame oil. Sprinkle the egg halves with sea salt and black sesame seeds and serve with a lemon wedge if you wish.
Recipe from Eat Happy by Melissa Hemsley (Ebury Press, £20)
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