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Julienne the onion, and cut the scallion whites into 5cm lengths.
In a pot, combine 700ml water, 1 tsp hondashi, 1 tbsp soy sauce, 1 tbsp mirin, and the scallion from step 1, and simmer to make the broth.
Blanch the beef in boiling water for 10 seconds to remove excess fat.
In a pan, bring the meat seasoning (1 tbsp soy sauce, 1 tbsp sugar, 1 tbsp mirin, 3 tbsp water) to a boil, then add the onion. Once the onion turns translucent, add the beef and simmer until the liquid reduces down.
Warm the tofu noodles in boiling water for 1 minute, drain well, and place in a bowl.
Pour in the broth from step 2, top with the beef and onion from step 4, and finish with a little scallion green.