Dicing the chicken is important so then you can get the countertop area and your hands cleaned before continuing.
In a medium bowl, whisk together 3 Tablespoons sake and 1 Tablespoon soy sauce.
Add the diced chicken to the bowl with the sake and soy mixture and toss. Then set aside to rest for 20 minutes at room temperature, or up to 2 hours in the fridge.
Make the Teriyaki Sauce
In a small saucepan, combine 1 Tablespoon sake, 3 Tablespoon soy, mirin and sugar and bring the mixture to a simmer on medium, whisking until the sugar is dissolved.
When the mixture is still warm, remove the pan from the heat and then add 1 Tbsp ginger and whisk well.
On a cutting board, finely chop the cabbage and then place it into a medium bowl.
Measure and add 1 Tbsp soy, 2 tsp rice vinegar and 1/4 tsp sesame oil, then toss and set aside if you want it raw. However, you can also cook the cabbage in a pan on medium heat for 3-5 minutes.
Place a fine mesh strainer into a bowl and strain the juice out of the chicken, then wipe out the bowl.
Replace the chicken into the whipped-out bowl and then add the cornstarch and toss with the chicken to coat it.
In a 12-inch skillet, warm to medium-high heat and add 2 teaspoons oil until just before it smokes.
To the hot skillet, add half of the chicken and place it in an even layer to cook without stirring, 3-4 minutes.
When the bottoms are browned, the edges are just opaque, flip the chicken and cook an additional 3 minutes.
Then, transfer the cooked chicken to a clean bowl or plate and continue to cook the remaining chicken.
When the chicken is all fully cooked, and out of the skillet, wipe out any residue and oil from the pan.
Then place the cooked chicken back into the pan and pour in the soy mixture, stirring to coat.
Stir the chicken in the soy-ginger sauce until just thickened, around 2 minutes.
Remove the chicken from the heat and serve with cooked Japanese-style short-grain rice and cabbage.
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