
When we heard about a special dessert called the suika baumkuchen being offered through online retailer Rakuten, we were pretty psyched, since it combines two of the greatest things on the planet: watermelon and cake. As a matter of fact, we were so excited that at first we thought it was only going to be available for one hour on August 1.
But as we spent hours drooling over the watermelon cake’s webpage, which had us so captivated we barely had time to use the Internet to look at pictures of cats and swimsuit models, we noticed something: the suika baumkuchen is actually available right now! We put in our order right away, and now we’re here to bring you our report on this incredible culinary crossover.
First, let’s break down the linguistics. Suika baumkuchen’s half-Japanese, half-German name translates as “watermelon tree cake,” because while it’s technically made in the style of a ring-shaped baumkuchen cake, it looks like a watermelon.
The inventive dessert is made by bakery La Soreiyu in Chiba Prefecture, and is being sold by the Okashi no Taiyou confectionary shop through Rakuten’s Japanese site. From 11 to 11:59 in the morning on August 1, it’ll be sold at a discounted price of 1,980 yen (US$16), but as long as you’re willing to pony up a little more, 2,268 yen will get you a watermelon cake right now.
After placing our order, we took up positions around the front door of the RocketNews24 office, standing at attention as we waited for the deliveryman. When he finally came a few days later, we were surprised that the cake came frozen and sealed in a cold pack.
We stuck it in the fridge to thaw, but two hours was as long as we could hold out before we decided it was time to dig in, whether or not all there were still any ice crystals on it.
Thankfully, by that point the cake had thawed enough that we could easily cut it. While most baumkuchen are a pale yellow in color, the outer layer of the suika baumkuchen is green, and as we sliced into it, the blade of our knife came away tinted with red, as though we were cutting into a real watermelon.
Instead of fruit, though, the inside is filled with a scarlet mousse. Unable to resist, we grabbed a slice of cake with our bare hands and bit in, and were pleasantly surprised to find that even the texture was similar to watermelon, since the mousse was still slushy and moist, which also explains why the cake ships frozen.
Even better, the mouse actually tastes like watermelon, since it’s made with watermelon juice. And while you may have pleasant summer memories of sitting on the back porch and spitting watermelon seeds, you’ll want to eat the ones in the suika baumkuchen, since they’re actually chocolate chips.
▼ Unfortunately, swallowing one won’t cause a chocolate factory to grow in your stomach.
There’s more fruit flavor to be found in the green portion of the cake itself, which tastes like melon. It’s not just the refreshing taste that makes the watermelon cake an appealing summertime treat, either, but the fact that it’s made with rice flour, which some of our staff felt results in a lighter cake than ordinary baumkuchen.
So in the end, watermelon makes the jump to cake amazingly well. If you want to get in on the suika baumkuchen fun, you can place your order here. Just don’t get confused and use it for suikawari at the beach.
Photos © RocketNews24
[ Read in Japanese ]







Watermelon bagels arrive in Japan, then in our bellies【Taste test】
Japanese bakery’s giant strawberry cake looks the part, but does it taste it? 【Taste test】
What do our Japanese writers think about putting lemon juice on watermelon?
Move over square watermelons – Japan now has square watermelon bread!
Can we pick out the expensive Japanese watermelon in a blind taste test?
Japan Extreme Budget Travel! A trip from Tokyo to Izumo for just 30,000 yen [Part 2]
Japanese restaurant chain serves Dragon Ball donuts and Senzu Beans this spring
Which convenience store onigiri rice balls are the most popular? Survey reveals surprising results
Tokyo street sweets: The must-snack treats of Nakano’s Refutei
Japan has only one airport named after a samurai, so let’s check out Kochi Ryoma【Photos】
New interactive Pokémon attraction coming to Universal Studios Japan
Miss World Japan: The great-times-20-granddaughter of samurai lord One-Eyed Dragon
Foreign tourists in Japan will get free Shinkansen tickets to promote regional tourism
How to get all-you-can eat doughnuts at Mister Donut for just 12 bucks!
Say hello to Japan’s new stationmaster cat!【Video】
The 10 most annoying things foreign tourists do on Japanese trains, according to locals
Highest Starbucks in Japan set to open this spring in the Tokyo sky
Tokyo Skytree turns pink for the cherry blossom season
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Japan’s new “Cunte” contact lenses aren’t pronounced like you’re probably thinking they are
Shibuya Station’s Hachiko Gate and Yamanote Line stairway locations change next month
Yakuzen ramen restaurant in Tokyo is very different to a yakuza ramen restaurant
Starbucks Japan adds new sakura Frappuccino and cherry blossom drinks to the menu
Japan just had its first same-month foreign tourist decrease in four years
Burning through cash just to throw things away tops list of headaches when moving house in Japan
Japan’s newest Shinkansen has no seats…or passengers [Video]
Foreigners accounting for over 80 percent of off-course skiers needing rescue in Japan’s Hokkaido
Super-salty pizza sends six kids to the hospital in Japan, linguistics blamed
Starbucks Japan unveils new sakura Frappuccino for cherry blossom season 2026
Take a trip to Japan’s Dododo Land, the most irritating place on Earth
Naruto and Converse team up for new line of shinobi sneakers[Photos]
Is China’s don’t-go-to-Japan warning affecting the lines at a popular Tokyo gyukatsu restaurant?
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
Starbucks Japan releases new drinkware and goods for Valentine’s Day
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
How to make Starbucks Japan’s new Watermelon Frappuccino taste even more watermelony
Is Starbucks Japan’s first-ever nationwide Watermelon Frappuccino the hit drink of summer?
Muji cake mania! Which of the 23 flavors of cake they sell are the best?
Daiso can help you beat the heat this summer with DIY fruity Suika and Melon Bars【Taste test】
Roasted nori seaweed cake might be a dessert even more Japanese than matcha sweets【Taste test】
Domino’s Pizza now sells fancy gold-topped cakes in Japan【Taste test】
Amazingly beautiful cakes inside fruit – Our newest Japanese dessert obsession【Photos】
Watermelon soup? We test out a strangely alluring recipe from Ajinomoto【Recipe】
Japanese Halloween cake is too scary for its own good
Beyond fruit sandwiches — Japan has cake sandwiches too!【Taste test】
Matcha cake from one of Japan’s top tea towns has a one-month wait, but is it worth it?【Taste test】
Does Japan’s T.M. Revolution J-rock cake really look like the song it’s named after?
Eat your way back to school with adorable randoseru Japanese backpack cakes
Is McDonald’s Japan’s new watermelon frappe worth your yen?
Starbucks’ retro Japanese kissaten menu debuts deliciously mature coffee gelatin cake【Taste test】
Tokyo’s Totoro Christmas cakes are now at the top of our Christmas wishlist【Photos】
Sweet potato sweets season arrives at convenience store Family Mart, so let’s go taste-test-crazy