Seafood ── Shellfish and cephalopods
Murasaki Uni
a spiny urchin whose pale gold roe belies its dark shell
Its shell and spines run purplish-black, but the roe inside is pale gold. Milder and more refined than bafun uni, said to have a distinctly grainy texture, eaten raw or as sushi, in season through summer.
- Other styles
Lineage
What it's made of
Somewhat larger than bafun uni at 5-6cm across its shell, covered in long, dark-purple spines. The roe inside runs pale, from white to light yellow, earning it the nickname "white uni." Milder and more refined than bafun uni, it's said to have a distinctly grainy texture.
How it's made
Commonly found from the intertidal zone into shallow rocky reefs, harvested by ama divers and free divers. To hold freshness, it is typically rinsed in alum and arranged into flat trays as itauni before shipping nationwide. It reportedly spawns May through August, so the best eating comes once the gonad refills outside that window, and some producing regions also sell it fresh, without the alum treatment.
Why it took this shape
Because it grazes on reef seaweed, rocky coasts where cold and warm currents meet and seaweed grows thick, like Sanriku, are said to produce especially well-filled urchins. Where seaweed beds thin out in a phenomenon called isoyake, growth reportedly suffers instead, so the health of the local seaweed directly decides the quality of the roe.
Before You Go
- How to shop at a supermarketHow to choose prepared foods, sashimi, and packaged sushi, when discount stickers tend to appear, region-only specialties, buying by weight, the checkout and bagging flow, and sampling etiquette at a local supermarket.
- Roadside stations, direct-sale stands, and marketsHow to enjoy buying food near where it's produced, visiting and shopping at morning markets and fish markets, what to expect at farm stands, and finding local food at roadside stations (michi-no-eki).
- Foods to look for in winterA guide to foods often seen in Japan around winter — nabe hot pot, fugu, oysters, crab, year-end soba, and osechi — with rough pointers for finding them.
Dishes in the same style
- Bafun UniA small urchin whose shell shape is said to resemble horse droppings, hence the name. Richer and creamier than murasaki uni, in season winter through spring, often sold preserved in brine rather than alum.
- HoyaAn invertebrate that lives fixed to rocks. Its distinct aroma, somewhere between brine and pineapple, and a lingering sweetness make it a delicacy people either love or avoid, eaten raw or vinegared, in season through summer.
Ingredients and dishes from this land
Known source
- Known source: Iwate, Miyako
The rocky Sanriku coast is rich in the seaweed this urchin feeds on.
Related lineage
- Bafun UniA small urchin whose shell shape is said to resemble horse droppings, hence the name. Richer and creamier than murasaki uni, in season winter through spring, often sold preserved in brine rather than alum.
- Uni GunkanSea urchin gonads mounded on vinegared rice, held in place by a band of nori. A sushi-specific solution for serving something that can't otherwise keep its own shape — whether it's alum-treated is said to shape both its taste and quality.