Steps
1. In a small bowl, combine soy sauce, mirin, sake, and sugar; stir until sugar dissolves to make the teriyaki sauce.
2. Heat vegetable oil in a frying pan over medium heat.
3. Place chicken thigh skin-side down and cook for 5-6 minutes until skin is crispy and golden.
4. Flip chicken and cook the other side for 4-5 minutes.
5. Pour teriyaki sauce over chicken and simmer, turning chicken to coat, until sauce thickens and glazes the chicken, about 2-3 minutes.
6. Remove chicken from pan and slice into bite-sized pieces.
7. Serve chicken over steamed rice, drizzle with remaining sauce from the pan.
8. Garnish with chopped green onions and toasted sesame seeds if desired.