Mix soy sauce, brown sugar, honey, rice vinegar, sesame oil, garlic, and ginger in a saucepan over medium heat.

Simmer 5 minutes, then stir in cornstarch slurry and cook until thickened, about 1-2 minutes.

Pat drumsticks dry and place on a lined baking sheet. Brush with half the sauce.

Roast at 425°F (220°C) for 25-30 minutes, turning and brushing with remaining sauce halfway through.

Broil 1-2 minutes if you want extra caramelization. Rest 5 minutes, then garnish.