In a lot of ways, convenience stores in Japan are more like miniature supermarkets. So while they still sell a lot of the candy and canned beverages their counterparts in other countries specialize in, you can also find plenty of edible, even gourmet-sounding food.
For example, the chain FamilyMart sells pouches of fried scallop meat, specifically the mantle, or part of the animal that attaches it to its shell. There’s a certain level of risk that comes with eating any mass-produced foodstuff, though, as one customer found out when he found what he felt was a foreign object in his pack of marine mollusks. And while generally the only thing you want to find in your food is, well, food, we suppose if we had to find something else mixed in there, we’d want what he discovered hiding in his snack: a pearl.
At most U.S. seafood markets, the mantle, which tends to have a tougher texture than the rest of the scallop, is removed prior to sale. In Japan, though, it’s commonly left on, since while it may not be considered the choice part of the scallop, most consider it to still be worth eating. The mantle’s second-tier status means it’s also the less expensive part of the animal, which is why they’re also sold as snacks, often meant to be paired with beer or other alcoholic beverages.
So when Japanese Twitter user Romy Canecry was feeling a bit peckish, he reached for a bag of fried scallop mantles, called yaki kaihimo in Japanese. But as he popped one into his mouth and chewed, suddenly his tooth hit something hard.
Japan has been a bit on edge about processed foods ever since the scandal involving McDonald’s and tainted chicken made the news last year, and Romy’s first thought was that something unnatural had fallen into the bag. He was half right, as while there was something other than scallops in there, the surprising extra was completely natural in origin.
おやつに貝紐たべてたら、白くて丸いものが歯にあたり、「すわ!異物混入か!」と色めき立ちましたが、どうやら真珠です。ありがとうございました。 pic.twitter.com/ArvF7sgOHL
— ロミ@Canecry (@romy_canecry) January 18, 2015
“I thought, ‘Oh man there’s something weird in here,’” recalls Romy, “but it turned out to be a pearl. Thank you, FamilyMart!”
This isn’t a case of a careless packaging plant worker with expensive fashion taste accidentally dropping a pearl into the bag, either. Although they’re most commonly associated with oysters, scallops are capable of forming the precious stones as well, in which case they’re called scallop pearls. Formed of roughly 90 percent calcium carbonate, scallop pearls’ other components are organic proteins and water, and since they’re non-toxic, no harm will befall you if you swallow one by accident.
Still, they are just as hard as you’d expect, so you’ll want to be careful not to crack a tooth or gag on one. That’s why Family Mart’s yaki kaihimo packaging includes a warning about them.
The text explains that on rare occasions, pearls may develop in shellfish, manifesting as a small white orb, and cautions customers to be careful when enjoying the product. It’s even written in blue to help the warning stand out, although since most people don’t go looking for directions on their snack packs, many yaki kaihimo aficionados are completely unaware of it.
The reason pearls can form in the mantle has to do with the body part’s function of secreting shell-creating components. Ordinarily, all of the secretions get turned into the protective coating, but rare as it may be, sometimes a pearl gets created in the process. As a matter of fact, other Twitter users have shared their dining discoveries of scallop pearls in the past.
https://twitter.com/monee7552/status/483095514066321409ホタテ食べてたらお母さんが食べたホタテに真珠入ってた。手前のやつ pic.twitter.com/sbBxHdJNnj
— やまる (@yamansecret) January 11, 2015
Japan is always quick to respond with caution to consumer safety issues, prompting concerned comments online about the danger scallop pearls would pose to your teeth if you were to bite down solidly and unwittingly on one. On the other hand, more than a few expressed a hope that they too could find some gemstones in their next batch of FamilyMart snacks.
“I heard some lucky guy found a pearl in his FamilyMart yaki kaihimo, so I just wet out and bought some.”
“I’m gonna keep scarfing them down until I find a pearl.”
“I’m totally going to find one and make a ring out of it.”
We’re still on the fence ourselves, since we do admit to liking both shellfish and riches, but we’re also pretty attached to our teeth. What we can say, though, is that we’re impressed to learn scallops can create pearls, and also a little disappointed they’d never told us about their special ability.
▼ Then again, we never asked.
Source: Naver Matome
Insert image: RocketNews24


We bought 21 packs of roasted shellfish to try to find a pearl – but did we get lucky?
FamilyMart cancels release of foie gras bento due to complaints over animal cruelty
Get Disney treats at FamilyMart this winter — including Olaf-shaped chocolate steamed buns!
Family Mart changes its Famichiki packaging for the first time in nine years
Coordinating a whole outfit with nothing but clothes from Japanese convenience store Family Mart
Kyoto temple bans visitors from wearing kimono
Starbucks Japan adds new Sweet Potato Frappuccino and Latte to the menu, but do they deliver the taste of autumn?
Japan’s first fall color forecast for 2026 is here!
American tourist in Japan arrested on charges of attempted murder and arson
A real-world Pokémon Poké Ball hotel is opening in Japan at a still-secret location [Video]
Starbucks Japan reveals new Tsukimi Moon-Viewing drinkware and gifts for autumn 2026
German woman rescued from Mt. Fuji after suffering altitude sickness symptoms, hiking to peak anyway
Solo travel in Japan: $3 all-you-can-drink deal at this conveyor belt restaurant is a fun time for one
Japan’s revolving sushi restaurant king Sushiro coming to U.S. this fall with high prices, no tipping
Mini CRT-lookalike Final Fantasy figurines are awesome pixel art music boxes [Video]
Japan’s final Penguin Suica train cards have already shipped, and when they’re gone, they’re gone
Studio Ghibli unveils new anime calendars and diary planners for 2027
Solo travel in Japan: Hidden beer garden in Tokyo is a haven for single visitors
Hobonichi unveils new 2027 planners, diaries and stationery with One Piece, Suica Penguin, Hello Kitty and a must-buy Mini Techo
Farewell Final Ceremony announced for Tokyo’s life-size Gundam statue, will stream live
Family Mart releases new Human Made Cup Noodle in Japan, with freebies for Nigo fans
Japan approves foreign resident visa renewal fee increases of up to 967 percent, starts soon
One Piece Day 2026 brings new art, music, and new cast announcements
Hikaru Utada sings new song in Shinkansen commercial for Japan’s Supreme Class cabins
12-year-old British girl who went missing in Tokyo found safe after visiting anime sites around Yokohama
7-year-old boy left behind on Mt. Fuji by his own dad
Sushi Bus: Japan’s first conveyor-belt bus lets you eat sushi while sightseeing around Tokyo
Pokémon Center Online designates first Pokémon items that will require Japanese ID card to buy
Japanese toilet aims to attract foreign tourists but not everybody is happy about it
New Japanese vending machine at Shinkansen station sells cups of ice on platform
Study finds hundreds of people in Indonesia legally named after Naruto, Inuyasha, other anime stars
Japan announces sudden 400-percent increase in visa fees for foreigners entering the country
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
Studio Ghibli has a new anime out, and there’s only one place in the world where you can see it
Starbucks Japan releases new drinkware and goods for Valentine’s Day
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Japan’s newest Shinkansen has no seats…or passengers [Video]
Tokyo subway installing new ticket gates that don’t accept payment through Suica or other IC cards
Japanese ninja certification exam attracts 131 candidates from Japan and abroad
Salomon releases Japan-exclusive Mt. Fuji hiking gear that doubles as an amazing souvenir
Put sesame oil in your coffee? Japanese maker says it’s the best way to start your day【Taste test】
Mr. Sato takes on Family Mart’s “All-You-Can-Eat Convenience Store Challenge!”
Drinking sake just got more convenient with convenience store Family Mart’s new canned brews
Japanese convenience store Family Mart announces abolishment of eat-in spaces
Potato ice cream from Family Mart takes ice cream to a whole other level【Taste Test】
Family Mart’s new Gyoza Dog proves Japanese convenience store food hits different
The top 5 ice creams you should try at Family Mart convenience stores in Japan this summer
7-Eleven Japan vs Family Mart: Who has the biggest convenience store cookie?
Family Mart is giving away free socks for your ice cream in Japan
Sanrio characters join forces with your favorite Japanese snack mascots as prizes at Family Mart
Family Mart’s cold ramen is the hottest convenience store meal in Japan right now
Family Mart unveils new Japanese bread that elevates convenience store food to mocchiri levels
Family Mart Japan installs red-eyed “Monster Wolf” to keep bears away from convenience store
Japanese convenience store Family Mart adding crane games to thousands of branches
Convenience store fried chicken going into school lunches in Japan for Family Mart anniversary
Conbini-talk with Mr. Sato: How to make a convenience store snack 100 times more delicious