Preheat oven to 190º.
In a small bowl mix together the honey, soy sauce, balsamic vinegar, tomato puree, garlic, ginger and 4 of the spring onions, reserving one chopped spring onion for garnish.
Using a small sharp knife, cut 3 diagonal slits into each drumstick and place in a shallow ovenproof dish.
Pour the marinade over and place into a preheated oven, uncovered, for 35-45 minutes, turning once halfway through. Cook until the marinade has reduced and the chicken is thoroughly cooked through.
Sprinkle the remaining spring onion and sesame seeds over the drumsticks and serve.