Marinate the Chicken: Cut chicken into bite size pieces. In a bowl, mix the chicken with soy sauce, rice wine, black pepper, and cornstarch. Let it sit for 10 minutes.
Pan-Fry the Chicken: Heat 1 tablespoons of oil over medium heat. Pan-fry the chicken for about 5 minutes total, turning halfway, until both sides are golden. Remove and set aside.
Build the broth: In the same pan, sauté the onions for about 2 minutes until slightly softened. Pour in the dashi, soy sauce, mirin, and sugar. Bring to a gentle simmer.
Simmer the Chicken: Add the chicken back in and cook for 2–3 minutes so the flavors blend together.
Add the Eggs: Lightly beat the eggs until just combined — you should still see streaks of yolk and white. This creates a beautiful contrast of yellow and white once cooked.
Drizzle the eggs evenly over the chicken and onions. Simmer for about 1 minute. You can cover the pan to help the egg whites set. (See note below)
Garnish & Serve: Spoon everything over warm rice.