Asari Misoshiru (あさりの味噌汁, manila clam miso soup)

Ingredients

Equipment Needed

• •Shallow bowl or tray for purging clams
• •Medium pot
• •Slotted spoon or tongs
• •Ladle and small whisk, or chopsticks for dissolving miso
• •Fine-mesh strainer, useful if the clams are sandy

Instructions

1. 1

   Purge the clams

   Set the clams in a shallow bowl or tray and cover them with salt water that tastes like the sea, about 3 percent salt. Keep them in one layer if you can, cover loosely, and leave them in a cool dark place for 1 hour, or up to 3 hours if they look sandy. Darkness keeps them calm and open enough to spit out grit. Discard any cracked clams, or any open ones that don't close when tapped.

   This is the step that decides the soup. A sweet clam with sand in it is still a failed clam.
2. 2

   Scrub and rinse

   Lift the clams out of the purge water instead of pouring the water over them, because the sand is sitting at the bottom. Scrub the shells against each other under running water until they feel clean. Don't soak them now in fresh water, which dulls the clean sea taste you just protected.

3. 3

   Steep the konbu

   Put 4 cups water and the konbu, if using, in a pot and warm it slowly over medium-low heat. Pull the konbu when small bubbles begin to climb the sides, before the water boils. Boiled konbu turns the broth faintly bitter and slick, and this soup wants the clams to speak clearly.

   Konbu is optional here. The asari make the main dashi, and the kelp only gives the broth a little roundness.
4. 4

   Open the clams

   Add the scrubbed clams to the pot and bring the water just to a gentle simmer. As each clam opens, lift it into a warm bowl with tongs or a slotted spoon. Taking them out as they open keeps the flesh plump. Leave them boiling and they tighten, which is a small tragedy in a very small shell.

5. 5

   Settle the broth

   Let the broth stand for 1 minute so any last grit settles, then ladle or strain it carefully into a clean pot, stopping before the sandy bottom. This is not fussiness. It is the difference between a clean misoshiru and one that reminds you of the beach in the wrong way.

6. 6

   Dissolve the miso

   Turn off the heat. Put the miso in a ladle, dip the ladle into the hot broth, and loosen the miso with chopsticks or a small whisk before stirring it back into the pot. Taste before adding all of it, because clams bring their own salt. Never boil the soup after the miso goes in. Heat wakes miso, but boiling flattens its fragrance.

   If the soup tastes thin, add a little more clam broth or miso. If it tastes salty, loosen it with a spoonful of hot water.
7. 7

   Serve at once

   Return the opened clams to the pot just long enough to warm through, then divide them among four bowls and ladle the miso broth over them. Finish with scallion or mitsuba. Serve immediately, while the clams are tender and the miso still smells alive.

Chef Tips

• •Buy live clams that are closed or close when tapped, and smell clean, like the shore at low tide, not sour or heavy. Sourcing first, always. No amount of miso will rescue a tired clam.
• •Use a miso that won't bully the shellfish. Awase miso is steady and good here; a very dark hatchō miso can be too strong unless you use it lightly.
• •Do not use powdered dashi for this soup. The clams are the dashi. Instant stock only adds salt and noise where the bowl needs clarity.
• •If you cook for a meatless table, this is not the bowl to adjust, because shellfish are the heart of it. Make a konbu and dried shiitake misoshiru instead, and call that honmono in its own right.

Advance Preparation

• •The clams can be purged up to 3 hours ahead in 3 percent salt water, then drained, covered with a damp cloth, and refrigerated until cooking.
• •Cook this soup just before serving. Once miso is added, reheating dulls the fragrance, and opened clams toughen if they sit in hot broth.
• •If your clams are already very clean, a 30 minute purge may be enough. If they came from a sandy market bin, give them the full time.

Frequently Asked Questions

Nutrition Information

1 serving (about 260g)