
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
10 times to avoid traveling in Japan in 2026
Our 52-year-old pole dancing reporter shares his tips for achieving your New Year’s exercise goal
We ate sushi made from Japan’s most expensive tuna ever【Taste test】
Japan’s Valentine’s Day gets extra cute with the return of KitKat Heartful Bear【Photos】
Say hello to Japan’s new stationmaster cat!【Video】
This quiet forest cafe in Japan lets you read all day in the house of a famous author
Umamusume anime girl plushie recalled for having parts she absolutely should not have【Pics】
Anime Industry Report shows overseas anime market is bigger than Japanese one, but is this a cultural tipping point?
The Purple Lucky Bag from Village Vanguard is an extra-large waste of money
More people in Japan quit sending New Year’s cards and many have started to regret it
Japanese beef bowl chain Sukiya’s 2026 Smile Box lucky bag basically pays for itself
Hayao Miyazaki says Happy New Year to Studio Ghibli fans with new art for Year of the Horse
Ramen restaurant’s English menu prices are nearly double its Japanese ones, denies discriminating
Starbucks Japan ready to get Year of the Horse started with adorable drinkware and plushies【Pics】
Top Japanese cosplayer Enako returns to Comiket after 6 years, creates mayhem with admirers
Cup Noodle tries an authentic Jiro-style ramen, but something’s not quite right
The best Starbucks Japan Frappuccinos we want to drink again in 2026
We revisited Sweets Paradise after a decade to see if Japan’s dessert buffet still delivers
That time Seiji called JASRAC to ask why he didn’t get paid royalties for his song being on TV
7-Eleven Japan starts new temporary luggage storage service in over 300 branches
Disillusionment at Tsukiji’s tourist-target prices led us to a great ramen restaurant in Tokyo
Starbucks teams up with 166-year-old Kyoto doll maker for Year of the Horse decorations【Photos】
Tokyo considering law requiring more trash cans following litter increase in heavily touristed area
Tokyo’s Tsukiji sushi neighborhood asks tour groups to stay away for the rest of the month
Tokyo event lets you travel back in time, for free, to celebrate 100 years since Showa era start
Japan may add Japanese language proficiency, lifestyle classes to permanent foreign resident requirements
Lacquerware supplier to emperor of Japan and Pokémon team up for new tableware
Starbucks Japan releases new zodiac chilled cup drink for 2026
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
Human washing machine pods coming to Japanese hotels【Photos】
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
Leave a Reply