Cube your chicken thighs and slice your scallions for the white part only. Add your chicken to a bowl along with all the ingredients for the marinade. Mix together thoroughly and let set in the fridge for 4 hours but ideally overnight.
Pull out chicken and discard excess marinade. Skewer your chicken two pieces at a time along with one scallion. Repeat this process until all the chicken has been skewered. Set your chicken in the fridge until ready to cook.
Preheat your grill for direct cooking to medium high heat (around 375F).
Add a basting skillet to warm over the fire for 1 minute. Next, add your bourbon to simmer for 2-3 minutes. Finally, add the rest of the Mirin Glaze to the skillet and let simmer until it has reduced by half (around 7-8 minutes). Once done, pull it off and let it cool.
Begin adding your chicken skewers over the coals to cook for 4-5 minutes per side. If they begin to burn, move that skewer to a cooler part of the grill. When the skewers are close to being done (and about 165F internal on the chicken), begin basting the outside of the skewers in the glaze to let it caramelize. Let cook for 1 more minute, then pull off and rest.
Garnish your skewers with Togarashi Seasoning, and enjoy!