1. With the stove off, add the sliced onions to a medium frying pan (I use a well-seasoned 11” carbon steel pan) in a single layer. Then, add the seasonings mixture. It should just cover the onions. If not, your frying pan is too big and you need to either increase the seasoning or use a smaller pan.
2. Turn on the heat to medium and bring it to a simmer. Once simmering, add the chicken on top of the onions.
3. Make sure the onions and chicken are evenly distributed. Once simmering again, lower the heat to medium low. Cook, uncovered, for 5 minutes or until the chicken is no longer pink and the onions are tender. Halfway through, flip the chicken. Tip: Evaporation reduces the sauce and intensifies the flavor.
4. We will add the eggs in two stages: Two-thirds of the eggs first, then the remaining one-third later. Now, increase the heat to medium. With the cooking liquid simmering (small bubbles around the edges), drizzle two-thirds of the eggs in a circular pattern over the chicken and onions, avoiding the edges of the pan where the eggs can easily overcook. Tip: Only drizzle the eggs if the cooking liquid is simmering, as with Egg Drop Soup. Also, try to add more egg whites at this stage, as the whites take longer to cook than the yolks. Ideally, we want to keep the yolks soft and runny for the final presentation.
5. If the heat is too strong, lower the heat. If the egg is moving toward the edges of the pan, gently gather it toward the center where the heat is not as strong. Optionally, you can cover the pan if the egg whites are taking a long time to set.
6. When the eggs are still runny but just set, add the rest of the eggs to the center and around the edges of the pan. Add the mitsuba (or green onion) on top and cook on medium low until the egg is done to your liking. Usually, oyakodon in Japan is served while the egg is almost set but still runny (raw eggs are safe to consume in Japan). Tip: For the remaining one-third of the egg, try to distribute more egg yolks so the oyakodon will have a bright yellow color on top. For a good presentation, you can add a beaten extra yolk at the end.
7. Serve steamed rice in individual serving bowls. Spoon the cooked chicken and egg mixture onto the steamed rice and drizzle the desired amount of pan sauce on top.