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1
Preheat the broiler.
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2
Spray the mushroom caps with vegetable oil cooking spray, season with salt and pepper and broil 6 inches from the heat, turning the caps once, until lightly browned and tender, about 6 minutes.
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3
Let cool, then thinly slice the mushrooms.
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4
In a small bowl, stir the sugar into the soy sauce and mirin until dissolved.
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5
In a large saucepan of boiling water, cook the soba noodles, stirring once or twice, until just tender, about 8 minutes.
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6
Drain the noodles, rinse under cold water and drain again thoroughly.
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7
Add the boiling water and instant dashi to the saucepan.
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8
Add the tofu and shiitake and simmer just until heated through, about 2 minutes.
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9
Add the spinach.
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10
Transfer the soba to 4 deep bowls and spoon the dashi mixture on top.
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11
Garnish the soba with the daikon, scallion and nori and serve right away, passing the soy sauce mixture alongside.
