Start by combining all the ingredients for the marinade in a bowl. This includes salt, soy sauce, mustard, honey, black pepper, paprika, fresh lemon juice, and garlic. Mix well until everything is fully blended into a smooth sauce. The marinade should have a nice balance of savory, sweet, and tangy flavors that will infuse the duck with incredible taste.

Place the whole duck in a large roasting pan or deep dish. Using a brush or your hands, coat the entire duck with the marinade, making sure to cover both sides evenly. Don’t forget to rub some of the marinade inside the cavity of the duck as well. This ensures every part of the duck is seasoned, which leads to better flavor throughout.

Next, transfer the duck into a large cooking bag. Pour the remaining marinade into the bag along with the duck. Seal the bag tightly and make sure the duck is completely submerged in the marinade. The bag helps lock in the flavors and keep the duck moist while it marinates.

Let the duck marinate for at least 20 hours in the fridge. During this time, turn the duck every few hours to ensure the marinade is evenly distributed and the meat absorbs all the flavors. The longer the duck marinates, the more flavorful and juicy it will be when roasted.

After 20 hours, preheat your oven to 180°C (350°F). Place the duck on a roasting rack or directly in a roasting pan and roast for 2.5 to 3 hours (if using a home-raised duck). Roasting the duck at this temperature ensures that the fat renders out properly, giving the skin a beautiful, crispy finish while keeping the meat tender and juicy.

Once the duck is fully roasted and golden brown, remove it from the oven and let it rest for a few minutes before carving. This will allow the juices to settle and keep the meat juicy.

Serve your perfectly roasted duck and enjoy the rich, flavorful taste!