Place ginger, garlic and green chilies in a blender. Add a little amount of water, and grind to a smooth paste.
Add in ground coriander, ground turmeric, ground black pepper, garam masala, vinegar, and enough salt to the ginger garlic mixture. Add more water (only if necessary) to make a smooth paste.
Marinate duck pieces for about one hour in the refrigerator.
Now preheat the oven to 200 degree Celsius(180 degree Celsius for fan forced oven).
Place the marinated duck pieces on a baking tray lined with grease-proof paper.
The spicy duck will be ready in 45 – 50 minutes.