
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?
Starbucks Japan reveals new Tsukimi Moon-Viewing drinkware and gifts for autumn 2026
A real-world Pokémon Poké Ball hotel is opening in Japan at a still-secret location [Video]
Japan’s first fall color forecast for 2026 is here!
Japan’s revolving sushi restaurant king Sushiro coming to U.S. this fall with high prices, no tipping
The mystery of Port Store, the Japanese convenience store that looks like a Lawson rip-off
Tamagotchi evolves into a ring for its 30th anniversary, preorders now open
Elderly couple donates 400 million yen to erect Myaku-Myaku statue in Osaka
Japan Railways announces unlimited-ride train pass for fall travel
Lawson convenience store opens its first mobile, trailer-style location in Japan
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
Japan approves foreign resident visa renewal fee increases of up to 967 percent, starts soon
Farewell Final Ceremony announced for Tokyo’s life-size Gundam statue, will stream live
Hobonichi unveils new 2027 planners, diaries and stationery with One Piece, Suica Penguin, Hello Kitty and a must-buy Mini Techo
Family Mart releases new Human Made Cup Noodle in Japan, with freebies for Nigo fans
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
Mister Donut releases new doughnuts that look and taste like Japanese sweet potatoes
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】
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?
Is McDonald’s Japan’s new watermelon frappe worth your yen?
Eat your way back to school with adorable randoseru Japanese backpack cakes
You can taste One Piece’s Flower Flower Fruit in real life thanks to this peachy collaboration
Is Kyoto’s raindrop cake as good as the original from Yamanashi?