
Our reporter is bitter no one but her ever bought her a better butter, like Uni Butter.
In the popular food retail chain Kaldi, there exists a product so delectable that it sells out almost as soon as it hits the shelves. It’s called Uni Butter, but the first part of the name isn’t “uni” in the sense of one butter to unite us all. Rather it’s the Japanese word “uni” – pronounced “ooh-nee” – which refers to those spikey aquatic creatures known as sea urchins in English.
▼ More often than not shoppers are greeted with a sign like this red one saying that Uni Butter is currently sold out and more stock is on the way.
Only a chosen few can be at a Kaldi when its stock of Uni Butter arrives, and recently one of those lucky people was our writer Mai Tsubomi. Restraining her excitement, she carefully took the pack to the check-out counter, avoiding the stares of competing shoppers, and then rushed home like Charlie after finding the golden ticket.
Uni Butter is very simple in concept, Kaldi just took ground-up sea urchin and blended it in with a rich-tasting butter. After opening her tub, Mai found the orange concoction to be very light and fluffy, more like whipped butter. She could easily scoop some up with a spoon.
The spoonful had a salty aroma of the ocean and Mai couldn’t help but take a quick lick of it. Sure enough, the flavor of sea urchin melted throughout her mouth, but keeping in mind this is essentially pure butter and all the calories that come with it, she decided to hold back from just wolfing the whole thing down straight.
Instead, she tried the recommended serving style of placing a dab of Uni Butter on a piping hot bowl of white rice.
It was a lot like putting a piece of sea urchin onto rice, only in this case the meat melts into a rich sauce that seeps throughout the grains. As a result, each chopstickful of rice was coated in a smooth and salty seafood taste.
According to Kaldi, also adding a touch of soy sauce really brings out the sea urchin flavor. Mai tried it and agrees but also feels that anyone would be perfectly happy with just the Uni Butter alone.
For her next trick, our writer decided to make a super simple seafood butter pasta dish by melting some Uni Butter on spaghetti and tossing on some seaweed for good measure. Interestingly the butter taste was firm in this dish, but the sea urchin notes were greatly diminished this way. Luckily the seaweed compensated for that and it was still a good meal overall.
The spread had a much more unified taste once again when topping a baguette. Mai thought she could eat this combination all day.
She felt that butter with a hint of sea urchin had endless applications from eggs to meats, and even as a dip for raw vegetables. Both delicious and versatile, it’s no wonder that Uni Butter is such a hot item at Kaldi which is already known for its excellent spreads.
Mai recommends everyone go out and try some right now for 567 yen (US$5) a pack. At least, she would if everyone had a chance of finding it.
Related: Kaldi
Photos ©SoraNews24
● Want to hear about SoraNews24’s latest articles as soon as they’re published? Follow us on Facebook and Twitter!
[ Read in Japanese ]








The butter pudding from Kaldi doesn’t taste like butter or pudding, so what does it taste like?
Funny reaction video shows Americans trying sea urchin for the first time
We try “almost sea urchin” Cup Noodle, the latest chapter in instant ramen trickery【Taste test】
Nissin comes out with new Cup Noodle using … “almost real sea urchin”!
We try a rotating sushi chain’s super high-quality 3-layer caviar, sea urchin & fatty tuna sushi
All Lotteria fast food restaurants in Japan to close by the end of March
Studio Ghibli releases new “komorebi” plush toys from Princess Mononoke and Spirited Away
Time to open the final Village Vanguard Luck Bag of 2026, the magical girl Red Lucky Bag
Starbucks Japan releases a new hojicha mousse latte for autumn
Starbucks Japan releases new drinkware and goods for Valentine’s Day
Japan super budget dining – What’s the best way to spend 1,000 yen at McDonald’s?
Mister Donut and Godiva continue their sweet sweets relationship with new treats on sale now in Japan
McDonald’s Japan adds first-ever shrimp rice burger to menu in gohan sandwich expansion
British man arrested for biting Japanese police officer during shokumu shitsumon questioning
We taste the Adult Cream Pie from McDonald’s Japan
Japan releases first official sakura cherry blossom forecast for 2026
Visiting Japan’s Gyarados Pokémon park in the city with a special connection to Magikarp【Photos】
Majority of Japanese women in survey regret marrying their husband, but that’s only half the story
Massive manga collaboration bringing 100 years of Shueisha manga to Uniqlo T-shirts【Photos】
Japan’s kid-friendly ski program is now selling Pikachu snowboards for a limited time only
Totoro cream puffs and Catbus cookies are finally available in downtown Tokyo
Japanese vending machine serves up unique drinks at four Tokyo train stations
Tokyo pub explicitly soft-bans customers older than 39 from entering
10 times to avoid traveling in Japan in 2026
Starbucks Japan ready to get Year of the Horse started with adorable drinkware and plushies【Pics】
Starbucks Japan releases new Frappuccino and latte for Valentine’s Day
Our 52-year-old pole dancing reporter shares his tips for achieving your New Year’s exercise goal
Ramen restaurant’s English menu prices are nearly double its Japanese ones, denies discriminating
Japanese beef bowl chain Sukiya’s 2026 Smile Box lucky bag basically pays for itself
Lacquerware supplier to emperor of Japan and Pokémon team up for new tableware
Survey asks foreign tourists what bothered them in Japan, more than half gave same answer
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
We deeply regret going into this tunnel on our walk in the mountains of Japan
Studio Ghibli releases Kodama forest spirits from Princess Mononoke to light up your home
Major Japanese hotel chain says reservations via overseas booking sites may not be valid
Put sesame oil in your coffee? Japanese maker says it’s the best way to start your day【Taste test】
No more using real katana for tourism activities, Japan’s National Police Agency says
Starbucks Japan reveals new sakura drinkware collection, inspired by evening cherry blossoms
Updated cherry blossom forecast shows extra-long sakura season for Japan this year
Sea urchins will fight over the same piece of cabbage, Japan is adorably shocked to learn
Japanese melon butter, where have you been all our lives? 【Taste Test】
2,500 yen for Tokyo ramen? High-end noodles in the high-rent Ginza district are totally worth it
Weird Japanese vending machine comes with a heartwarming twist
New spreadable French Toast from Japan is a game-changer
We make chashu in just eight minutes, thanks to Kaldi’s microwaveable roast pork【Taste Test】
Trying Family Mart’s Alternative Seafood Rice Bowl made with 5 imitation toppings【Taste test】
We ordered a box of koi-shaped sushi to see if they taste as good as they look 【Taste Test】
‘Butter mochi’ flavoured chocolate may be the best kind of Tirol we’ve ever tasted
Imitation fish sperm appears at 7-Eleven Japan【Taste test】
We try eating, and also try to eat, a shark burger and deep sea fish burger【Taste test?】
Creepy creatures from the seabed that you can eat!【Taste Test】
Coffee-infused rice for rice balls and curry? Taste-testing a recipe from Japan’s coffee experts
New spreadable melon pan changes the way we eat toast in Japan
What is a Butter Manju? We try one from this mega popular Tokyo dessert shop
Leave a Reply