Sesame seeds and spring onions, to garnish (optional)
Directions
For the marinade, whisk the miso, sugar, sake and mirin in a bowl until smooth. Add the chicken thighs and toss to coat. Cover and refrigerate a few hours (up to 48 hours for more flavor).
Preheat the oven to 400F (200C). Let the chicken come to room temperature, then place skin side up on a lined baking tray. Bake for 20 minutes.
Remove the tray and spoon the rest of the marinade over the chicken. Turn the oven up to 450F (220C) and bake another 15-20 minutes, until beginning to char and cooked through.
Let cool slightly, garnish with sesame seeds and spring onions, and serve.