
No more careful timing needed for the perfectly boiled egg!
Boiling water plus egg equals boiled egg, right? It sounds simple enough, but if you’re aiming for a certain kind of boiled egg, it can take a lot of trial and error to get the right timing. But Japanese electronics maker Koizumi Seiki has taken out the hassle with the Egg Steamer, which – you guessed it – steams eggs (and no, this isn’t a hack like the rice cooker hack).
This recently popular device claims to steam the perfectly boiled egg, whether that’s a rock-hard one or a half-gooey one. And you don’t even need a timer or a stovetop! So of course, we had to put it to the test. Our Japanese-language reporter Natsuki Gojo purchased one for 3,278 yen (US$29) to test it at home.
Koizumi Seiki’s Egg Steamer measures just 23 by 11 by 13.5 centimeters (9 by 4.3 by 5.3 inches), making it perfectly compact for smaller kitchens. Along with the steaming device itself it comes with a lid, a liquid measuring cup, and a cleaning brush.
▼ It’s the little things that matter.
The inside is pretty simple. It consists of a highly conductive stainless steel bottom and a removable egg tray to keep your eggs in place while they cook.
▼ No unevenly cooked whites here!
For this experiment, Natsuki decided to test out three popular types of eggs: a soft-boiled egg, a hard-boiled egg, and an onsen tamago – a slow-cooked egg that resembles a poached egg. She started off by measuring enough water to make two soft-boiled eggs, as indicated by the “mid” label on the liquid measuring cup along with the “1-2” measurement to the right of it.
▼ The more eggs you add, the less water you need.
Next, she added the water to the steamer, set the egg stand in place, and added her two eggs. She closed the lid and set the dial to the appropriate “mid” setting and waited for the magic to happen.
▼ Even the settings on the machine are easy to understand.
She watched as the eggs boiled away, fogging up her camera lens with its reassuring heat. The Egg Steamer beeps when it’s ready, so she waited and listened.
▼ Ding!
When she opened up the two morsels, she found…a perfectly half-gooey center!
▼ And with hardly any effort on her part.
After waiting for it to cool down, she had similarly perfect results with the hard-boiled setting. And by some strange magic, they were super easy to peel.
▼ All she added was water, though! What sorcery is this?
As for the onsen tamago? They were perfectly cooked as well, just like she’d been served at a restaurant. These are particularly difficult to get the hang of cooking without breaking the yolk, so Natsuki was pleasantly surprised.
▼ Can you believe it’s homemade?
While it only takes 10 minutes for the gadget to fully cook soft-boiled eggs and 16 minutes for hard-boiled ones, it takes a 40 minutes to make the onsen tamago, so definitely plan for some extra cooking time if the third type is what you’re planning to have with dinner. Another thing to be aware of is that while you can make six boiled eggs at once, the device only allows you to make three onsen tamago at a time.
▼ The onsen tamago need more space to cook perfectly!
Natsuki also found that you had to be very careful measuring the correct amount of water for the machine. Besides that, another thing that may be a con to some people is that you can’t wash the stainless steel part of the machine – you can just wipe it clean.
Otherwise, she thinks the Egg Steamer is a great investment, especially if you eat eggs on the regular! It will save you a lot of effort when it comes to timing the boil of your egg just right. And while that’s cooking, you can make the rest of your lunch in a bento box-sized rice cooker!
Images ©SoraNews24
● Want to hear about SoraNews24’s latest articles as soon as they’re published? Follow us on Facebook and Twitter!
[ Read in Japanese ]









Japanese onsen egg maker from 100-yen store Daiso needs to be on your shopping list
Latest unbelievable chip flavour in Japan captures the runny egg flavour of onsen tamago
Which Japanese convenience store has the best onsen tamago hot spring eggs?
Does this egg timer from Japanese 100-yen store Daiso really work?
Is Daiso’s microwave Japanese rolled omelet maker worth your time and money? [Taste test]
Nine amazing off-the-beaten-path cherry blossom spots in Japan for yaezakura and shidarezakura
Stunning central Japan wisteria festival is like a purple fantasy straight out of a Ghibli movie
Studio Ghibli unveils new Rollbahn notebook in honour of Howl’s Moving Castle
Studio Ghibli adds new anime tumblers to its cool streetwear brand in Japan
Godiva now makes tofu in Japan, and sakura chocolate tofu too![Taste test]
Starbucks Japan releases new My Fruit³ Frappuccino at only 34 stores around the country
Nine great places to see spring flowers in Japan, as chosen by travelers (with almost no sakura)
Cherry blossoms begin blooming in Japan with record-early starts for sakura season
Tokyo government organizes food truck event to clear out delinquent/homeless teen gathering area
Mr. Sato Schools Fellow Reporter at “Go! Go! Curry” Speed Eating Contest
Train station platform ramen store closes its doors on half a century of history in Tokyo
Japanese onsen egg maker from 100-yen store Daiso needs to be on your shopping list
Studio Ghibli adds new Mother’s Day gift sets to its anime collection in Japan
The next time you’re feeling stressed out, you could relax on a Pokémon Psyduck chair from Japan
Virtual idol Hatsune Miku redesigned with look that adds new elements and brings back old ones
When will the cherry blossoms reach full bloom in Japan this year?[Forecast]
7-Eleven Japan’s giant fried chicken skewer would be too big to eat, so it’s really for cuddling
Starbucks Japan unveils new sakura cherry blossom collection for hanami season 2026
Studio Ghibli releases Catbus pullback keychain that runs like the anime character
The 10 most annoying things foreign tourists do on Japanese trains, according to locals
Starbucks Japan releases first-ever Hinamatsuri Girls’ Day Frappuccino
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
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Japan’s newest Shinkansen has no seats…or passengers [Video]
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
You can now make chocolate scrambled eggs, blur breakfast/dessert line with Japan’s Choco Tama
Does the Shirotama Maker kitchen gadget really create perfect instant ramen eggs?
We found the prettiest TKG ever at a restaurant specializing in raw eggs on rice in Tokyo
We try all-you-can-eat raw eggs for 730 yen, turns out to be way better than it sounds
Solar Chef: We tried cooking an egg using the power of the sun and a magnifying glass
Japan goes crazy for “gaming eggs,” and here’s the super-easy recipe【SoraKitchen】
Perfect instant ramen eggs every time! Cup Noodle’s Nissin creates Shirotama Maker kitchen gadget
Grab your pantyhose and let’s make inverted eggs, a Japanese foodie favorite from the Edo period
New contraption from Japan lets you cook paper-thin egg omelets in your microwave
Celebrate TGK Day with a classic of Japanese kitchens, but with some luxurious ingredients
Make soy sauce eggs in minutes with popular new Japanese product from Daiso
Make fluffy Japanese omelettes in the microwave with this handy kitchen gadget
7-Eleven Japan’s egg broth and rice may be the dream combination we’ve been missing【SoraKitchen】
Japan’s new carriable one-person hot pot maker is our newest cooking gadget obsession
Tokyo has a “phantom egg shop” with ingredients for the best tamago-kake gohan rice bowl ever