Onsen Tamago
Onsen tamago
Alternative namesHot spring egg
Place of originJapan
Main ingredientschicken egg

Onsen tamago (Japanese: 温泉卵 or 温泉玉子, lit. 'hot spring egg') is a traditional Japanese low temperature boiled egg which is slow cooked in the hot waters of onsen in Japan.[1]

The egg has a unique texture in that the white tastes like a delicate custard (milky and soft) and the yolk comes out firm, but retains the colour and creamy texture of an uncooked yolk.[2] This special texture is the result of the egg yolk and egg white solidifying at different temperatures.[3]

The egg is poached within the shell and is served with the shell removed in a small cup together with a sauce of broth and soy sauce.


The traditional way of cooking onsen tamago is to place eggs into rope nets and leave them in an onsen, with water that is approximately 70 °C (158 °F) for 30 to 40 minutes. After cooking, the shell is cracked open and the egg is served in seasoned bonito dashi (Japanese stock) for breakfast, or with a light sauce made with mirin, dashi and soy sauce with chopped spring onions sprinkled over the top.[4]


  1. ^ "Onsen Tamago | Japan Blog - Tokyo Osaka Nagoya Kyoto". Japanvisitor.blogspot.com. 2010-01-13. Retrieved 2013-10-25.
  2. ^ "Onsen Tamago (hot spring egg)". Norecipes.com. 2008-10-29. Retrieved 2013-10-25.
  3. ^ "NOZAWA ONSEN Village | Hot Spring | Onsen-tamago (eggs boiled in hot spring water)". Nozawakanko.jp. Retrieved 2013-10-25.
  4. ^ Die Zeit (31 de marzo de 2010), p. 62.