Prick the drumsticks with a fork.
In a bowl combine ketchup, orange juice, garlic paste, mustard paste, salt, oregano, black pepper and vinegar.
Marinate the drumsticks in the mixture for at least 20 minutes.
Heat the grill pan and brush with the oil.
Place the drumsticks on the grill pan and pour oil on them and grill from both sides.
When they are grilled, put them in a baking tray and bake for 15 minutes.
Combine the ingredients of the glaze and simmer.
When drumsticks are ready, place them in the serving dish and drizzle glaze on them.
Garnish and serve hot.