Place chicken thighs into the slow cooker. Season lightly with salt and pepper.
Mix all sauce ingredients in a bowl, then pour over chicken.
Cook on LOW for 5–6 hours or HIGH for 3–4 hours.
The sauce thickens as it cooks and reduces slightly in the slow cooker. For a thicker glaze, remove the lid for the last 20–30 minutes or broil the chicken at the end.
Serve over rice with green onions and sesame seeds.