Raindrop Cake

This low calorie and popular food trend can be easily made at home with just a few ingredients!

Over the last few months, I’ve been very intrigued by the Raindrop Cake. Inspired by a traditional Japanese dessert, Mizu Shingen Mochi, the dessert was introduced to the US by Chef Darren Wong at Smorgasburg in New York. Since then, the unique looking dessert has become very popular.

The name Raindrop Cake comes from its appearance– which looks like a giant raindrop– as well as the taste. When you bite in, the dessert dissolves in your mouth, like eating rain. The dessert is very delicate and is supposed to only hold its form for about 30 minutes.

The raindrop itself is made out of only two ingredients: water and agar. By itself, the cake is fairly tasteless. But it’s paired with roasted soy bean flour (kinako) and black sugar syrup (kuromitsu), which add sweetness and texture. The end result is a surprisingly refreshing dish which I really enjoyed. The dessert is apparently also very popular in Japan because the raindrop itself is almost zero calories. (Even with the toppings, you’re looking at around 50 calories per serving.)

Even though the raindrop cake is only two ingredients, it actually took me several trials before getting the right proportions. Before attempting to make it, I did a lot of research. I’m documenting my findings here, so that hopefully you won’t have to go through the same trial and errors and can have success on the first try.


Agar. Agar is a a gelatin-like substance that is derived from algae. It is commonly used in Asian desserts, especially any that have a jelly consistency. Normally, agar-based desserts have a somewhat firmer, jelly texture. However, based on all the descriptions I read about the raindrop cake, it’s supposed to be very delicate and only hold its form for about 30 minutes before dissolving.

When I started reading through recipes, I found big discrepancies in the amount of agar used. Some recipes called for a few grams (which is the equivalent to a few teaspoons) and some called for barely 1/8 of a teaspoon. When I used a larger amount of agar, the mixture was cloudy and the end result was very firm. It would set within an hour and it did not dissolve in my mouth. I’m still puzzled by how the recipes work with the large amounts of agar, but I do have one theory. I think that the recipes that call for the larger amounts of agar are using a special agar, even though the recipes just say “agar powder.” I noticed a few videos talk about using a Japanese-style agar or a Cool Agar. I’ve never worked with either, but just the name Cool Agar makes me think it’s an agar that would keep the crystal clear appearance and not turn cloudy like regular agar powder does. I also think that the Japanese version may be firmer than the one introduced in the US. When I was looking at the videos, the cakes didn’t seem to be quite as delicate.

When I used a very small amount of agar, the water did just barely turn into a cake. At first, I tried 1/8 tsp. This was enough to allow the cakes to set, but they were a little too delicate. When I tried to take them out of the molds, they broke in half. So I played around with it, increasing a little more agar at a time, until I found the right balance. I was surprised by how much of a difference a tiny bit of agar could make. For instance, adding just one more 1/8 tsp was enough to make the cake look more opaque than translucent.

Water. The original recipe calls for mineral water. I tried it both with mineral water and filtered water and didn’t really notice much of a difference. Since we don’t usually have mineral water in the house, I’m just going to stick to filtered water from now on.

These are the basic ingredients you need:

The agar powder can be found at most Asian supermarkets. Make sure you buy one that is pure agar powder. The two toppings (roasted soybean flour and black/brown sugar syrup) can easily be found at a Japanese market, though you can also make the syrup yourself. It’s basically a simple syrup made with brown sugar.

To get the shape, I bought this Freshware 6 Cavities Half Circles Silicone Mold. It seemed to be about the right size as the ones I’ve seen in photos and you can make six at a time. They also slide out very easily. You can try using other similar shaped molds, just make sure you use something that allows you to easily remove these because they are delicate and you don’t want to break them. I’ve seen people use the sphere ice ball molds. I actually own those as well, but I wasn’t sure how well they’d turn out in those, so I didn’t try.

Overall, I actually really enjoyed this dessert. The soybean powder mixed with the black sugar syrup is a delicious combination. When eaten with this water cake, it becomes a very light and refreshing dessert.

Special Tools

Freshware 6 Cavities Half Circles Silicone Mold

Raindrop Cake


  • 3/4 cup water
  • 1/8 tsp + 1/16 tsp agar powder


  • 1/2- 1 tbsp roasted soybean flour
  • 1-2 tbsp black sugar syup


1. In a small saucepan, add agar powder and water and stir with a spatula a few times, until the agar powder dissolves into the water.

2. Turn your stovetop to medium heat and bring the agar water mixture to a boil. Maintaining a medium heat level, allow mixture to boil (without a lid) for one minute, then turn off heat. Try to be as accurate with the timing as possible. If you don't heat long enough, your agar won't be fully dissolved. If you cook too long, your mixture will condense down too much. Use a spatula to stir the mixture a few times. Pour mixture into molds. You should have enough to fill exactly two cavities if you are using the silicone molds I used.

3. Place molds into the fridge to set. I recommend letting them set overnight, or at least 10 hours. When they are ready, they should easily slide out just by you slightly tilting the molds. Do not take the cakes out of the fridge until you are ready to serve because they will start to melt after 20-30 minutes. Add your cakes to a plate. Add some soybean flour to your plate and drizzle black sugar syrup on top of the cake or on the side.

1 cake is about 30-50 calories, depending on how much topping you add.

All images and content are © Kirbie's Cravings.

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12 comments on “Raindrop Cake”

  1. This looks intriguing, I like how you presented the dessert in a dome shape with the kinako and kuromitsu on either side. I will definitely try this! Thanks!

  2. It’s amazing that you can get a cake out of this proportion of water and agar powder!. I’m not sure if I want to buy the silicone mold so I might try this using silicone cupcake liners.

    • I’ve also seen videos where they poured it into glasses that had round bottoms, but those were the japanese version so I’m not sure how easy they are to slide out with just regular glass.

  3. This looks so interesting and beautiful! 

  4. that is so mouth watering. when I saw the photo, I am sure my kids will totally love it. Will it be ok to add gelatin powder into that?

  5. omg never heard of this but it looks stunning! if I get ambitious, i’ll find this agar powder and use your proven method =P

    • agar agar powder is pretty easy to find. The one I used can be found at most Asian supermarkets. I got mine at Ranch 99

  6. Can you unmold these and keep them refrigerated for a Couple days or will they still fall apart

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