In a stock pot, cook the anchovies, onion and kombu sheets in 2 liters of water on medium heat. Let simmer for about 1 hour before removing the kombu sheets and anchovies. Add in the salt and sesame oil.
Toss the anchovies in the oil and garlic powder. Spread them out on a lined baking sheet and bake in a pre-heated oven at 350F for 20 minutes. Take the baking sheet out and give the anchovies another toss. Put it back in the oven for another 5 minutes. Once the anchovies cool down, store them in an airtight container. This keeps for a month in the fridge.
Cook the noodle according to the package’sinstructions.
Heat 2 ladles of broth in a small sauce pan with the mushroom. When the mixture gently boils, drop in the egg and spinach and continue to cook until the mushroom softens.
Transfer one serving of noodle into a bowl and ladle the broth on top. Sprinkle with the crispy anchovies, shallot and spring onion.