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1
Bring dashi to gentle simmer in saucepan over medium heat; do not allow to boil vigorously as this damages delicate umami compounds.
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2
Rehydrate wakame in separate bowl with 100ml cold water for 5 minutes; drain and divide among warmed miso soup bowls.
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3
Dissolve miso paste in small ladle using 100ml hot dashi, working with wooden spoon to create smooth slurry without lumps.
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4
Gently pour miso slurry into simmering dashi, stirring with wooden spoon to distribute; taste and adjust salinity if needed.
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5
Add silken tofu cubes carefully; heat broth to 70°C (just below boiling point) for 2 minutes, as prolonged heating coagulates proteins and diminishes flavor.
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6
Divide hot miso soup into warmed bowls; garnish with white scallion slices, grated daikon and mirin if desired.
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7
Top each bowl with green scallion slices and serve immediately; miso soup should be consumed fresh within 2 minutes of serving for optimal temperature and flavor intensity.