01 -
Take a medium bowl, mix soy sauce and cornstarch until smooth. Stir in white sugar, brown sugar, mirin, minced garlic, grated ginger, and black pepper. Blend everything well and put it aside.
02 -
Using paper towels, dry off the chicken thighs, and trim away any extra fat. Lay the meat on a cutting board, cover it with plastic wrap, and pound it to about 1/2 inch thickness using a mallet.
03 -
Pierce each piece of chicken with a fork to help it soak in the marinade. Put the chicken into a pan or bowl, then pour the marinade over it. Coat all sides, cover it, and refrigerate overnight, flipping the pieces partway. Store any clean leftover marinade in a sealed container and chill.
04 -
About an hour before cooking, take the marinated chicken out of the fridge. Heat up a greased grill pan until it’s really hot. Throw away the used marinade, then grill the chicken over medium-high heat for about 5 minutes on each side, basting if needed.
05 -
During the grilling, simmer the extra marinade you saved in a pan on the stove. Stir and boil for about a minute until it's a little thicker. Adjust sweetness by adding more sugar if needed, then let it cool.
06 -
Cut the cooked chicken into slices and lay it on rice, salad, or another side of your choice. Pour the sauce over and sprinkle some sesame seeds or green onion on top if you want.