Food

You can make this stunning rainbow prism cake with just 5 ingredients

rainbow prism cake
This beautiful rainbow prism cake only requires five ingredients. Hiroya Tsunekawa
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There's no shortage of incredible food trends on TikTok and Instagram. But many of them can be time-consuming, or require expensive ingredients. 

But you don't have to spend a lot of time or money to create something beautiful, and the proof is in this rainbow prism cake.

The stunning milk gelatin cake, created by Japanese pop-up restaurant owner and photographer Hiroya Tsunekawa, takes just five ingredients and 30 minutes to make. 

All you need is: water, milk, granulated sugar, shaved ice syrup or fruit juice, and agar powder (which is available at Whole Foods, Walmart, and Asian markets). 

Tsunekawa shared the recipe for his rainbow prism cake on Twitter, which was translated by SoraNews24. 

First, combine 4 grams (0.14 ounces) of agar powder, 150 milliliters (5.07 ounces) of water, and 60 grams (2.12 ounces) of granulated sugar into a pot and bring it to a boil. 

Turn off the heat when the mixture begins boiling and stir in 300 milliliters (10.14 ounces) of milk. Then, pop your mixture into the fridge so that it can harden into a gelatin. This will be the base of your cake. 

Then, get a second pot and repeat the first step. But, instead of adding milk to the mixture once you've taken it off the heat, add another 300 milliliters (10.14 ounces) of water and 20 milliliters (0.68 ounces) of shaved ice syrup or fruit juice. Throw this second mixture into the fridge so it can harden as well. 

rainbow prism cake
Create mixtures with different colors to help create the prism effect.  Hiroya Tsunekawa

Depending on how many colors you want for your cake, repeat the previous step with different syrups or juices to help create the prism effect. 

Each mixture should remain in the fridge for around 30 minutes so it can harden. Then, take your colorful mixtures and cut the gelatin into small cubes so that you can arrange them on top of the white gelatin base. 

rainbow prism cake
Cut your different gelatin into cubes and arrange them on the milky white base, like so.  Hiroya Tsunekawa

This creates a prism effect, as you'll see once you've cut yourself a slice of cake. It tastes "sweet and creamy" but has a "jiggly texture," according to SoraNews24. 

rainbow prism cake
This rainbow prism cake just needs five ingredients.  Hiroya Tsunekawa

Tsunekawa's stunning cake has been a huge hit on Twitter, where his original post has received more than 78,000 likes at the time of writing. 

He's also inspired many fans to create their own prism cakes, which they've shown off in the comments. 

Their photos are proof that the prism cake can still look beautiful, even if you only use two colors. 

Tsunekawa, who is also a fashion designer, travels around Japan making cream soda and curry for his Tabi Suru Kissa (which translates to "Traveling Café"). 

He calls himself a "cream soda craftsman" and said he dreams of opening a coffee shop one day.

In the meantime, Tsunekawa continues to share his soda creations through soothing videos.

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Anneta Konstantinides
Anneta Konstantinides is a lifestyle correspondent at Business Insider, with a focus on food and travel. She loves taking readers inside Michelin-starred kitchens and exploring the world of fine-dining, and she's always trying to find the best Ina Garten and Gordon Ramsay recipes. Her second home is LAX, where she's often catching a flight and reviewing airlines.Anneta has also been reporting on the pageant industry for the last six years and has interviewed every Miss USA and Miss Universe winner since 2019. She was a finalist at the LA Press Club Awards for her investigation into the  2022 Miss USA scandal and was featured in The New York Times Presents episode "How to Fix a Pageant" on Hulu in September 2023. After graduating from UCLA with a B.A in English Literature and a minor in film & television, Anneta worked as a journalist in London, Sydney, New York City, Los Angeles, and Washington, DC. You can reach Anneta at akonstantinides@jkmperu.com.