Wash the duck thoroughly inside and out. Cut off the wings leaving just the drumettes. Cut out the backbone with scissors and remove the neck. Open and lay flat butterflied. Pat the inside with paper towels to get rid of excess moisture.
Sprinkle 1 tbsp Sukrin Gold, garlic powder, five spice, ginger, white pepper, salt and orange zest over the inside of the duck. Break up and spread over cinnamon quills. Cut orange in half and squeeze over juice from one half. Squeeze juice from the ther half into a small bowl and set aside.
Rub spices, zest and juice into the inside of the duck. Place star anise onto the inside of the duck in different spots and the two orange halves down the centre, skin side down.
Using foil, cover up the inside meat of the duck, making sure to leave the skin exposed. Place a plate or tray over the duck and flip so it is now skin side up. Pat the skin dry with paper towels and wipe off any spices that may have gotten onto the skin.
In the bowl with the orange juice add vinegar, remaining 1 tsp Sukrin Gold and the stevia glycerite. Mix well. Brush the skin of the duck all over with marinade. Place in the fridge and dry skin for 2 days.
Line roasting dish with foil, place rack inside. Put duck on rack with foil cover still on cavity. Roast at 180C for around 45 mins - 1 hour.