Heartopia Onsen Egg: Recipe and Cooking Guide
In brief
Discover how to unlock and prepare the Onsen Egg in Heartopia by taking part in the winter egg hunt and photographing 16 cracked eggs. It's an accessible recipe requiring just one ingredient (the Pasteurized Egg) and capable of generating solid profits if you master the cooking to reach at least 3 stars.
In Heartopia, the Winter Frost event has brought its share of seasonal activities, including the Onsen Egg quest, which is both enjoyable and rewarding. This guide will help you discover how to make this tasty dish by finding the Onsen Egg recipe.

The Onsen Egg quest
To unlock the Onsen Egg recipe, you need to take part in the winter egg hunt, a quest that involves photographing a total of 16 cracked eggs scattered across the Heartopia map. The sixteenth egg appears on the sixteenth day on Onsen Mountain, under a wooden path overlooking the old sea. After photographing all the eggs, start the conversation, and you'll be rewarded with event materials as well as the Onsen Egg recipe.

Onsen Egg recipe and preparation
After photographing all the eggs, head to the events menu and then to the activities section to collect your reward; then open the menu, go to the appropriate section and click the button to add the recipe to your cooking recipe list.
To prepare the Onsen Egg, you'll only need one ingredient, the Pasteurized Egg, which can be bought from Massimo, but be aware that it's an expensive egg! To get one egg you'll need to pay 100 gold coins, with a maximum of 50 eggs per day.

To prepare the Onsen Egg, you need to go to the hot springs area on Onsen Mountain, where cooking baskets are available in the pools, reserved solely for cooking this egg.
Go to Onsen Mountain, approach a cooking basket and place your egg in the basket, then wait a few moments for the egg to cook.
Tip
You can also use several baskets to cook multiple eggs at once.

The selling prices of Onsen Eggs depend on their quality, determined by the number of stars. Here is a table summarizing the selling prices:
| Onsen Egg Quality | Selling Price |
|---|---|
| 1 Star | 130 gold coins |
| 2 Stars | 195 gold coins |
| 3 Stars | 260 gold coins |
| 4 Stars | 520 gold coins |
| 5 Stars | 1,040 gold coins |
Note
While for beginners cooking Onsen Eggs isn't very profitable, since margins remain low due to results mostly being one star, for cooks who have mastered cooking to the point of consistently getting at least 3 stars, this recipe can become a reliable source of daily profits!
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Frequently asked questions
How do you unlock the Onsen Egg recipe?
Where can you buy the Pasteurized Egg and at what price?
Where should you cook your Onsen Egg?
Is this recipe profitable for beginners?
Key takeaways
- Complete the 16 cracked eggs hunt to unlock the Onsen Egg recipe.
- The Pasteurized Egg costs 100 gold coins at Massimo's, limited to 50 per day.
- Cook your eggs in the baskets at Onsen Mountain to earn between 130 and 1,040 gold coins depending on quality.
- 3+ star results provide a reliable and profitable source of daily income.
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