Tips and notes
1- Butter and garlic are my personal additions, which enhance the flavor. However, in traditional preparation, these two ingredients are not used. For a traditional taste, you can omit them
2- In this traditional sauce recipe, the level of saltiness may vary depending on personal taste. After adding the water into the sauce mixture, you can taste and adjust the seasoning. If it's too salty, you can add more water and sugar.
3- How to make the onsen eggs is in the video for reference
4- You can use higher quality thinly sliced beef instead of fatty beef slices