蛤 · ハマグリ · hamaguri

Hamaguri

Hamaguri is the common orient clam — the classic edomae clam, simmered until plump and tender and glazed with sweet sauce. A symbol of marital harmony at Girls' Day.

Also known as

hard clam, orient clam

Species

Meretrix lusoria (Common orient clam)

Category

Shellfish & clams (kai)

Texture

plump, tender — sweet, briny, umami-rich

Peak season

Feb, Mar, Apr

Sustainability

varies — Native Japanese hamaguri is severely depleted; most sold today is imported Meretrix or the introduced hard clam (hon-binosu).

Mercury

Not in the FDA consumer table

Pregnancy

Generally safe

Often swapped with

imported Meretrix (China/Korea), hon-binosu / quahog (Mercenaria mercenaria)

Price tier

$$$

The simmered clam

Hamaguri is the common orient clam, and it’s the great simmered neta of edomae sushi. The shucked clam is gently poached in a sweet-savory broth until it’s plump, tender and saturated with umami, then laid over rice — never rubbery, which is the whole mark of careful cooking. It’s also the star of clear suimono broth.

A clam for weddings

Hamaguri shells have a quirk: the two halves of a single clam fit only each other, and no other. That made the clam a symbol of marital fidelity — which is why hamaguri soup is served at weddings and at Hina-matsuri, the Girls’ Day festival in March.

What’s really in the shell

Here’s the hard truth: the native Japanese hamaguri (Meretrix lusoria) has been devastated by habitat loss and overharvest, and is now rare in the wild. Most “hamaguri” on sale is imported Meretrix from China or Korea, or the introduced North American quahog (hon-binosu-gai) that naturalized in Tokyo Bay. Still delicious — but worth knowing what’s under the lacquer of tsume.

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