This recipe is (DF).
1 cup water
3/4 cup shoyu (soy sauce)
1/4 cup packed light brown sugar
1/4 cup mirin
1/4 teaspoon freshly ground black pepper
4 cloves garlic
1 (3-inch) piece fresh ginger
4 medium scallions
8 bone-in, skin-on chicken thighs
Place water, shoyu (soy sauce), packed light brown sugar, mirin, and black pepper in a large pot or Dutch oven. Bring to a simmer over medium-high heat, stirring until the sugar is dissolved.
Meanwhile, prepare the following, adding each to the pot as you complete it: Peel the garlic cloves. Smash the ginger with the flat side of a knife. Halve the scallions.
Add the chicken thighs to the pot skin-side down in an even layer (they can overlap). Cover and reduce the heat to medium-low. Simmer for 30 minutes.
Uncover and flip the chicken thighs so that they are skin-side up, arranging them into a single layer. Adjust the heat as needed to maintain a simmer so that the sauce bubbles between but not up and over the pieces of chicken. Simmer uncovered until the chicken is tender, about 30 minutes more.
Serve.
Notes
This does not need to be served with rice and it should be cut into smaller pieces after cooking and before serving.