01 - In a small bowl, combine dashi stock, soy sauce, mirin, sake, and sugar. Stir thoroughly until the sugar completely dissolves.
02 - Heat a medium skillet over medium heat. Add the sliced onion and pour in the sauce mixture. Simmer for 3–4 minutes until the onion becomes tender and translucent.
03 - Add chicken pieces to the pan. Cover and simmer for 6–8 minutes, turning pieces halfway through, until chicken is fully cooked and no longer pink in the center.
04 - Lightly beat eggs in a bowl. Pour evenly over the chicken and onion mixture. Cover and cook for 1–2 minutes until eggs are just set but still slightly runny. Remove from heat immediately to prevent overcooking.
05 - Divide hot steamed rice between two serving bowls. Gently slide the chicken and egg mixture over the rice, ensuring sauce is distributed evenly.
06 - Sprinkle sliced green onions over the top. Serve immediately while hot for the best texture and flavor.