Wash the duck, blanch in boiling water for 10 mins. Remove , wash and drain. Marinate the duck with 1 tbsp of dark soya sauce.
Heat 1 tbsp oil in Instant Pot using the Saute function. Saute B until fragrant, add in C and fry. Add in the duck and D. Pour 700ml water over the duck just to cover it.
Select Pressure Cook on High for 30 minutes. Natural Release the pressure when done cooking.
Open the lid. Add in E and select Saute Mode. Bring to a boil. Remove the duck onto a plate.
Strain the stock and return the stock to the inner pot. Press saute and thicken with 1 tbsp cornflour mixed with 2 tbsp water.