Japanese Miso Clam and Dashi Chowder
A silky, umami-rich chowder that marries the briny sweetness of clams with the savory depth of dashi and miso. Tender tofu and mushrooms add body and texture while maintaining the light, delicate character of a traditional Japanese soup. This is comfort food that tastes like a Japanese coastal kitchen, warming from the inside out.
- Prep
- 25 min
- Cook
- 20 min
- Wait
- 5 min
- Total
- 50 min
- Makes
- 4 servings (about 1¼ cups each)
Steps
Before you start
- Rinse clams thoroughly under cold running water, scrubbing shells with a stiff brush to remove sand and grit; discard any with cracked shells or that don't close when tapped
- Have dashi stock prepared or use instant dashi (kombu and bonito, or instant powder)
- Slice mushrooms and cube tofu ahead of time so you're not juggling tasks during cooking
Heat stock and open clams
- Pour 6 cups dashi stock into a large pot and bring to a gentle boil over medium-high heat.
- Add minced ginger and sake, then slide in all the scrubbed clams.
- Cover and cook for 5–7 minutes, stirring once halfway through, until the clams open.
- As they open, use tongs or a slotted spoon to transfer them to a bowl; discard any that remain tightly closed after 10 minutes.
- Once cooled slightly, remove the clam meat from the shells, reserving the meat in a separate bowl.
- Strain the cooking liquid through a fine-mesh sieve lined with cheesecloth into a clean pot, leaving any sand behind; you should have about 6 cups of flavorful liquid.
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Ready when: Clam shells open, revealing meat inside
Tip: Don't overcook the clams—they toughen quickly. Discard any that refuse to open, as they may be dead.
Sauté mushrooms
- Return the strained stock to the pot and bring to a simmer over medium heat.
- Add the sliced shiitake mushrooms and scallion white and light-green parts.
- Simmer gently for 2 minutes to soften the mushrooms slightly and bloom their flavor.
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Ready when: Mushrooms are just tender; scallions brighten and soften slightly
Whisk miso into soup
- In a small bowl, whisk the 3 tablespoons miso paste with a ladleful (about ½ cup) of the simmering broth until smooth and completely dissolved.
- This prevents lumping.
- Slowly pour the miso slurry back into the pot, stirring gently to distribute evenly.
- Do not boil after adding miso, as high heat damages the flavor and nutrients.
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Ready when: Miso is fully dissolved, liquid is smooth and uniform in color
Tip: Keep the heat below a gentle simmer once miso is added. Boiling miso destroys its probiotic qualities and makes the broth taste cooked-out.
Add tofu and remaining mushrooms
- Gently stir in the silken tofu cubes and the enoki mushrooms (if using).
- Simmer for 2 minutes over medium-low heat, stirring occasionally, until the tofu is heated through and the enoki are tender.
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Ready when: Tofu cubes are warmed through, enoki are just tender
Tip: Stir very gently to keep the silken tofu intact; it breaks easily.
Return clams and finish soup
- Add the reserved cooked clam meat to the pot, stirring gently.
- Taste the broth and season with a pinch of kosher salt if needed (the miso and clam liquid already provide saltiness, so be conservative).
- Simmer for just 1 minute more until everything is piping hot.
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Ready when: Clam meat is heated through; broth steams gently
Tip: Taste for salt before adding; over-salting masks the delicate miso and clam flavors.
Ladle and garnish
- Ladle the chowder into four deep bowls, distributing clams, tofu, and mushrooms evenly.
- Top each bowl with the reserved scallion green tops and thin ribbons of nori seaweed if desired.
- Serve immediately while the broth is hot.
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Tip: Cut the nori just before serving so it stays crisp and doesn't soften from steam.
Good to know
Tips
- Never boil the soup after adding miso—heat above a gentle simmer destroys the live cultures and makes the broth taste flat and one-dimensional.
- Buy clams the same day you plan to cook them, or store them in a breathable bag in the coldest part of your fridge (ideally 40°F or below) with a damp cloth. They'll keep for 2–3 days if well-chilled.
- If your dashi stock is bland, bump up the umami by stirring in an extra ½ teaspoon of miso or a pinch of dried bonito flakes just before serving.
- Silken tofu is delicate; handle it gently to avoid breaking the curds. A wide, shallow spoon works better than a thin one for adding it to the pot.
Make ahead
You can make the dashi stock and prep all vegetables up to 2 hours ahead, storing them separately in sealed containers in the refrigerator. The finished chowder is best served immediately, as the texture of silken tofu and delicate mushrooms degrades when reheated. If you must make it ahead, store the clam meat and mushrooms separately from the broth in airtight containers for up to 1 day, then gently reheat the broth over medium-low heat and add the solids just before serving.
Storage & reheating
Store leftovers in an airtight container in the refrigerator for up to 2 days. The tofu will soften further. To reheat: warm gently over medium-low heat without boiling. Do not freeze, as tofu and mushrooms will become grainy and unappetizing.
Substitutions
- fresh shiitake mushrooms → cremini or baby bella mushrooms. Use the same weight; they'll be slightly earthier but still work well. Cremini lack the intense umami of shiitake, so consider adding an extra ½ teaspoon miso to compensate.
- silken tofu → soft tofu (kinugoshi) or firm tofu cubed. Soft tofu has a similar silky texture. Firm tofu will be chewier; reduce its cooking time to prevent toughening.
- littleneck or Manila clams, in shell → mussels or littleneck clams of different size. Mussels cook faster (3–4 minutes); Manila clams are smaller and sweeter, so use 3 lbs. Manila. Monitor carefully so they don't overcook.
- white or awase miso paste → red miso (aka aka miso). Red miso is earthier and saltier than white; use 2½ tablespoons instead of 3, and taste before adjusting. The broth will be deeper in color and flavor.
