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1
If using store-bought chicken broth or homemade broth that doesn't gel when chilled, add broth to a large mixing bowl and sprinkle gelatin all over; let stand 10 minutes. Transfer broth to a large pot or
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2
and bring to a simmer over high heat, then reduce heat to low. Stir in squid ink until fully dissolved. Cover and keep warm.
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3
Meanwhile, heat 2 tablespoons (30ml) oil in a large skillet over high heat until lightly smoking. Season squid with salt, add to skillet, and cook, stirring occasionally, until just cooked through and browned in spots, 3 to 4 minutes. Transfer squid to a plate and keep warm. Add remaining 4 tablespoons (60ml) oil to skillet, heat until shimmering over medium-high heat, and add mushrooms. Cook, stirring occasionally, until well browned. Season with salt and transfer to a plate; keep warm.
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4
Return broth to a simmer, add mussels, and cook until opened, about 5 minutes. Stir in miso and season broth with salt.
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5
While mussels are cooking, dissolve baking soda in the 4 quarts (3.8L) boiling water and season with salt. Boil spaghetti until just al dente. Drain.
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6
Transfer spaghetti to bowls. Ladle broth on top. Garnish with mussels, squid, mushrooms, salmon roe (spoon roe into an empty mussel-shell half for best presentation), micro greens, and nori. Drizzle black garlic oil on top and serve.
