Chef Takumi
Akadashi (赤だし, Nagoya red-miso soup)
Akadashi asks you to trust the dark miso. Build a clear dashi, loosen the Hatchō mame-miso gently, and the soup turns coffee-dark, savory, and clean.
Culinary Explorer
A cooking platform built around craft, culture, and the stories behind what we eat.
Hamaguri no Osuimono (はまぐりのお吸い物, Girls' Day clam soup)
Created by
For Hinamatsuri, the clam does the generous work: open it gently in konbu water and sake, season only at the end, and the broth turns clear, briny, and quietly festive.
Soups & Stews
Japanese
Special Occasion
Celebration
Dinner Party
2 hr 15 min
Active Time
15 min cook•2 hr 30 min total
Yield4 servings
Hamaguri sit in the bowl like a small promise: two shells, one pair, opened just enough to show the sweet meat inside. On March 3, Hinamatsuri, that pairing is why we serve them. The soup is often treated as formal, but honmono here is plain work. Good clams, clean water, a strip of konbu, and the courage to stop before you fuss it into dullness.
The first detail is sourcing. Buy clams that feel heavy and shut tight, with shells that smell clean and faintly of the sea. If they gape and won't close when tapped, they don't belong in this bowl. There is nothing hidden here, no soy-dark broth, no strong sauce. The clam is the dashi, so the clam must be good.
Cook them gently from cold water with konbu and a little sake. Pull the konbu before the water boils, because boiled kelp turns the broth bitter and slick. Lift each clam as it opens, because one extra minute changes sweet and tender into rubbery, and we are not making festival soup to practice jaw strength. Salt comes last, a pinch at a time, because every clam brings its own sea with it. That is the whole dish: restraint, timing, and a clear bowl with room to breathe.
Hinamatsuri, the girls' festival held on the third day of the third month, grew from Jōshi no Sekku, one of the five seasonal observances formalized under the Tokugawa shogunate in the seventeenth century. Hamaguri were attached to the day because the two halves of one clam shell fit only each other, a symbolism also seen in kai-awase, the shell-matching game known from the Heian court. By the Edo period, the March table commonly paired clam soup with festival foods such as hishi-mochi and later chirashi-zushi, turning a clear soup into a wish for a lasting match.
The technique, the tradition, and the story behind every dish.
Discover Culinary ExplorerIngredients
hamaguri clams
Quantity
8 large (about 500g)
scrubbed and sand-purged
sea salt
Quantity
30g
for 1 liter purging water
cool water
Quantity
1 liter
for purging
cold water
Quantity
4 cups
for the soup
konbu (dried kelp)
Quantity
1 piece (about 5g)
sake
Quantity
2 tablespoons
sea salt
Quantity
1/2 teaspoon, plus more as needed
mitsuba
Quantity
4 small sprigs
cut into 2-inch lengths
yuzu peel
Quantity
4 thin strips
white pith removed
hana-fu (flower-shaped wheat gluten) (optional)
Quantity
4 small pieces
soaked and squeezed dry
| Ingredient | Quantity |
|---|---|
| hamaguri clamsscrubbed and sand-purged | 8 large (about 500g) |
| sea saltfor 1 liter purging water | 30g |
| cool waterfor purging | 1 liter |
| cold waterfor the soup | 4 cups |
| konbu (dried kelp) | 1 piece (about 5g) |
| sake | 2 tablespoons |
| sea salt | 1/2 teaspoon, plus more as needed |
| mitsubacut into 2-inch lengths | 4 small sprigs |
| yuzu peelwhite pith removed | 4 thin strips |
| hana-fu (flower-shaped wheat gluten) (optional)soaked and squeezed dry | 4 small pieces |
Equipment Needed
- •Wide shallow pot
- •Fine-mesh strainer lined with a clean cloth
- •Lidded lacquer soup bowls (wan), or small heatproof bowls with saucers as lids
- •Shallow bowl or tray for sand-purging
Instructions
- 1
Purge the clams
Dissolve 30g sea salt in 1 liter cool water to make a brine as salty as the sea. Set the clams in a single layer, cover them with the brine, and leave them in a cool dark place for 2 hours, or refrigerate overnight. Darkness helps them relax and spit out sand. Lift them from the bowl rather than pouring the sandy water over them, then scrub the shells. Discard any cracked clams, and any open ones that won't close when tapped.
A clear soup has nowhere to hide grit. Purging is not fussiness, it is the difference between a clean bowl and a sandy one. - 2
Start the base
Wipe the konbu with a damp cloth, but don't wash it. The pale bloom on the surface is flavor. Put the 4 cups cold water, konbu, sake, and cleaned clams in a wide pot. Starting cold lets the clams give their liquor to the water gradually, while the sake softens the raw edge without making itself loud.
- 3
Open gently
Set the pot over medium-low heat. When the water trembles and small bubbles gather at the sides, lift out the konbu before the pot boils. Let the broth come to a quiet simmer. As each clam opens, lift it out to a plate. Skim any pale foam from the surface, and discard any clam that stays shut after the others have opened.
Boiled konbu turns the broth faintly bitter and slick. Overcooked clams turn tough. Both rules are just ways of saying the same thing: protect the clarity. - 4
Strain and season
If you see grit in the pot, strain the broth through a cloth-lined fine strainer into a clean pot. Taste before you season. Add the 1/2 teaspoon salt a little at a time, stopping when the broth tastes clean, briny, and gentle. If it tastes flat, it needs salt. If it tastes sharp or too salty, add a spoonful or two of hot water.
Salt comes last because clams vary. Some bring half the sea with them, and a careful cook listens before speaking. - 5
Set the bowls
Place two opened clams in each lidded soup bowl, keeping the shells with their original partners if you can. Add one piece of hana-fu if using. The bowl should look underfilled, not meager. Osuimono needs ma, the empty space that lets the clear broth read as part of the dish.
- 6
Finish with fragrance
Warm the seasoned broth just until small bubbles gather at the edge, then ladle it over the clams. Lay one sprig of mitsuba and one strip of yuzu peel in each bowl. Put the lids on for a minute so the fragrance stays in the bowl, then serve at once.
Chef Tips
- •Ask the fishmonger what came in today and choose clams that feel heavy for their size, with closed shells and a clean sea smell. Sourcing first, always. A tired clam cannot be rescued by careful seasoning.
- •Hamaguri are the Hinamatsuri shell. Small littlenecks can make a good clear clam soup if hamaguri are unavailable, but they don't carry the same paired-shell meaning. Say that plainly and the dish stays honest.
- •Use konbu as a quiet foundation and let the clams do the rest. Katsuobushi is wonderful in many clear soups, but here it would crowd the shellfish, and the shellfish is the point.
- •Mitsuba is worth seeking for its clean green fragrance. If you can't find it, use only the yuzu peel before adding a loud herb that makes a small soup sound confused.
- •Serve the clams soon after they open. Holding them in hot broth toughens the meat, and this dish is too plain to forgive that kind of rough handling.
Advance Preparation
- •The clams can be purged earlier the same day, or overnight in the refrigerator. Keep them cool in the brine and rinse them just before cooking.
- •The konbu can soak in the 4 cups soup water for 30 minutes, or overnight in the refrigerator for a gentler base. Keep the clams separate until cooking.
- •Prepare the mitsuba, yuzu peel, and hana-fu before heating the clams. Once the shells open, the dish should move straight to the bowls.
- •Do not finish the soup ahead. Cooked clams toughen as they sit, and the clear broth loses the freshness that makes this dish worth serving.
Frequently Asked Questions
Nutrition Information
1 serving (about 260g)
Calories
30 calories
Total Fat
0 g
Saturated Fat
0 g
Trans Fat
0 g
Unsaturated Fat
0 g
Cholesterol
10 mg
Sodium
500 mg
Total Carbohydrates
3 g
Dietary Fiber
0 g
Sugars
0 g
Protein
4 g
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