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1
Bring a large pot of unsalted water to a full rolling boil. Add the fresh saimin noodles and cook according to their thickness — fresh kansui noodles are done when they are uniformly yellow, springy to the bite, and carry a faint alkaline scent. Drain immediately and divide among four warmed bowls. This is the step on which the dish lives or dies: fresh saimin noodles made with kansui are the dish; no dried substitution produces the same result.
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2
Heat the dashi-based broth in a separate pot until it steams steadily and carries a clean, pronounced umami aroma. Do not boil hard; the broth is ready when the surface shimmers and the scent is fully open.
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3
Ladle the hot broth over the noodles in each bowl. The broth should be golden, clear, and deep in colour — cloudiness signals either over-agitation or an insufficiently clarified stock.
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4
Arrange the toppings: sliced kamaboko (pink against the golden broth), sliced char siu, a sheet of nori at the bowl's edge, and a scatter of green onion. The bowl is complete when the contrast of pink, white, and green sits cleanly against the yellow noodles and golden broth.