Thinly slice the onion and diagonally cut the green onion into 1cm pieces.

Cut the chicken thigh into bite-sized pieces.

In a small frying pan, heat water and sukiyaki sauce over medium heat until boiling. Add chicken and remove any scum.

Add the onion and simmer for about 3 minutes over medium heat until the chicken is cooked.

Pour half of the beaten eggs into the pan, cover with a lid, and cook for about 40 seconds until set.

Pour the remaining eggs into the pan and cook uncovered for about 1 minute while monitoring the consistency.