Step 1: Prepare the Marinade: In a large bowl, whisk together the shoyu, water, brown sugar, rice vinegar, minced garlic, grated ginger, sesame oil, and black pepper until the brown sugar is fully dissolved. This flavorful combination forms the heart of the dish.
Step 2: Marinate the Chicken: Place the chicken pieces in the bowl with the marinade, ensuring they are fully submerged. Cover the bowl and refrigerate for at least 2 hours, or preferably overnight, to allow the flavors to penetrate the chicken thoroughly.
Step 3: Cook the Chicken: Preheat oven to 350F (175C). Arrange the marinated chicken pieces in a single layer in a baking dish. Pour the remaining marinade over the chicken.
Step 4: Bake or Simmer: Bake in the preheated oven for 60 minutes, or until the chicken is cooked through and the juices run clear when pierced with a fork. Alternatively, the chicken can be simmered on the stovetop over medium-low heat for about 45-60 minutes, covered, until tender.
Step 5: Glaze the Chicken (Optional): For a stickier glaze, during the last 15 minutes of cooking, baste the chicken with the pan juices every 5 minutes. This will caramelize the sauce and create a beautiful, glossy finish.
Step 6: Garnish and Serve: Remove the chicken from the oven (or stovetop) and let it rest for a few minutes before serving. Garnish with chopped green onions. Serve hot with steamed rice and your favorite side dishes.
Optional Tips: For a richer flavor, add a tablespoon of honey or maple syrup to the marinade. If you prefer a spicier kick, incorporate a pinch of red pepper flakes or a dash of chili garlic sauce.