Making Onsen Eggs at the Yutsutsu of Yunomine Onsen | A Guide to Preparation, Waiting, and Enjoying the Experience

As you walk through Yunomine Onsen, you're greeted by steam rising from the valley and the faint scent of sulfur. At the heart of it all lies the Arayu area, known locally as the "Yutsutsu." Dipping eggs into the hot spring water here to make onsen tamago (hot-spring eggs) is one of those experiences that tends to linger in a traveler's memory.

The Yutsutsu: A Hot Spring Source for Cooking Food

The Yutsutsu is a place where you can feel the gushing waters of Yunomine Onsen up close. In this small hot spring town along the river, both tourists and locals gather around the rising steam. More than just a sight to behold, it's a place where people actually dip eggs and vegetables into the water to cook and eat them—offering a glimpse into the daily life of this town.

The name "onsen tamago" might make it sound like you simply drop an ordinary egg into hot water. But when you actually try it, the steam, the sounds, and the smells all come together to create an experience entirely different from cooking in an everyday kitchen.

What to Prepare Beforehand

Specific procedures and prices may vary depending on the season and operator, so it's best to check the signs and information on-site. With that in mind, here are a few things that are handy to have:

• A small towel or hand towel: Useful for drying your hands wet from the steam or wiping moisture off the eggs.
• A wallet with small change: Keep it easy to access for any purchases you make on-site.
• Salt: Bringing some along is helpful for seasoning when you eat. It may also be available locally.
• Wet wipes: The sulfur smell can linger on your hands, so one or two wipes come in handy.

Shoes with good grip are recommended, as the ground can be wet from the steam.

The Basic Process

Here's the general flow:

1. Get your eggs ready (purchase them according to on-site guidance)
2. Place the eggs in a container and gently lower them into the hot water of the Yutsutsu
3. Wait for the recommended time (generally about 10 minutes for onsen tamago, though the result varies with the water's condition)
4. Carefully lift them out when the time is up
5. Let them cool, then peel the shells

Some people prefer slightly soft whites with a runny yolk, while others like them fully set. You can adjust the firmness by changing the cooking time, so part of the fun is trying it a few times to find your own perfect timing.

Turning the 10-Minute Wait into "Breathing Room"

Once the eggs are in the water, all that's left is to wait. Instead of just standing around, try spending the time like this:

• Watch the rising steam or take in the riverside scenery
• Take a stroll along the nearby streets of the hot spring town
• Chat with your companions about your plans for later

If you want to keep track of the time, your smartphone's timer is useful—just be careful not to drop it near the hot water.

Start by Eating Them Plain

The eggs can be hotter than you'd expect when you take them out. Let them cool a little before peeling. For the first bite, try them without any seasoning to appreciate the natural sweetness of the egg. Then add a pinch of salt. Bringing soy sauce is another option, but try not to overload your bag.

For Your Safety

• The water is extremely hot—don't lean over, and always check your footing before handling the eggs
• Small children should be accompanied by an adult at all times and kept from getting too close to the railing
• This is a shared space, so be considerate and take turns
• Always follow local rules and posted guidelines

Why Onsen Eggs Become the Flavor of This Hot Spring Town

The onsen eggs at the Yutsutsu are a humble dish, cooked by nothing more than the power of the spring water itself. Waiting patiently, blowing on them to cool them down, adding just a pinch of salt—this entire sequence fits perfectly with the rhythm of a trip to Yunomine Onsen. Enjoy them casually, whether as a snack after your bath or as a light bite before heading out for a walk.

For the history of Yunomine Onsen, yugori purification and the Dainichi-goe trail, see our complete Yunomine Onsen guide.

Image: 龍神温泉　元湯 (via (公社)和歌山県観光連盟)