In a small saucepan, combine the soy sauce, mirin, sake, sugar, honey, minced garlic, and minced ginger.
Bring the mixture to a boil over medium heat, stirring to dissolve the sugar.
Reduce the heat and let the sauce simmer for about 10 minutes, or until it thickens slightly. Remove from heat and set aside.
Heat the vegetable oil in a large skillet or non-stick pan over medium-high heat.
Add the chicken thighs to the skillet and cook for about 5-7 minutes on each side, or until they are cooked through and golden brown.
Pour the prepared teriyaki sauce over the cooked chicken thighs in the skillet.
Reduce the heat to low and let the chicken simmer in the sauce for about 5 minutes, turning occasionally to coat the chicken evenly with the sauce.
Remove the chicken from the skillet and slice it into strips.
Arrange the chicken on a serving plate and drizzle with any remaining sauce from the skillet.
Garnish with sesame seeds and sliced green onions.
Enjoy your meal!