Preheat the oven to 175°C (350°F). Place the ground duck meat in a dish. Add all meatloaf ingredients and mix. Pour mixture into a greased 22 cm x 12 cm x 8 cm baking pan. Cover with parchment paper and the lid. Place in a double-boiler in the oven for one hour. Uncover and continue cooking for another 30 minutes.
Watercress sauce ingredients: