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Onsen Tamago served in a small bowl with soy sauce and sesame seeds
Fresh Onsen Tamago with sesame and scallions

Soy-Marinated Onsen Eggs with Toasted Sesame

Author: Flavelo
Recipes Vegetarian & Vegan Dishes Quick Meals
'Onsen Tamago' translates to 'hot spring eggs'. The Japanese discovered that egg whites and yolks solidify at different temperatures. By maintaining a magical temperature range, the whites become milky and soft, while the yolks turn into a rich, custard-like cream. It's not raw; it's a textural masterpiece you can recreate at home with a simple science trick.
🕒 Prep Time 5 mins
🍳 Cook Time 15 mins
⌛ Total Time 20 mins
🍽️ Servings 4 servings
🔥 Calories 90 kcal
🌍 Cuisine Japanese

Ingredients

Equipment Needed

  • Pot with lid
  • Kitchen thermometer (optional but recommended)
  • Bowl with ice water

Allergen Information

⚠️ Egg
⚠️ Soy
⚠️ Sesame

Instructions

1 ✓

Bring 4 cups of water to a rolling boil in a pot. Once boiling, remove from heat immediately and pour in 3/4 cup of cold tap water.

Tip: This trick instantly drops the water temperature to roughly 167-175°F (75-80°C), which is the ideal starting point before adding the eggs.
2 ✓

Gently lower the eggs into the water, cover the pot with a lid, and let it sit for 15 minutes (do not put it back on the stove!).

Tip: The residual heat does the work here. Egg whites coagulate at 144°F (62°C), while yolks thicken around 149-158°F (65-70°C).
3 ✓

After 15 minutes, remove the eggs and plunge them into an ice water bath for 5 minutes.

Tip: The thermal shock stops the cooking process, preventing the insides from hardening.
4 ✓

Meanwhile, mix the soy sauce and mirin. Thinly slice the scallion.

Tip: The sweetness of the mirin balances the saltiness of the soy sauce (flavor balance).
5 ✓

Crack the eggs into small bowls (be gentle, they are delicate!), drizzle with the sauce, and garnish with sesame seeds and scallions.

Tip: The white should be jelly-like and the yolk creamy, like soft butter.

Recipe FAQ

Why didn't the whites set?
The water temperature was too low. Egg whites only begin to turn opaque around 140-150°F.
How long do they last?
They keep in the fridge for 1-2 days, but they are best enjoyed fresh.

Ingredients

  • 4 large Eggs (room temperature)
  • 4 cups Water
  • 3/4 cup Cold Water (to adjust temp)
  • 2 tbsp Toasted Sesame Seeds
  • 2 tbsp Soy Sauce
  • 1 stalk Scallion (Green Onion)
  • 1 tbsp Mirin (Sweet Japanese Rice Wine)