main ingredients: 1 duck eggs, 35g of food-grade sodium hydroxide, 2g of black tea powder and 4g

auxiliary materials: 1g

Step 1: Prepare the required materials

Step 2: Wash the duck eggs and dry the surface moisture

Step 3: Salt, black tea powder, Pour water into the container

Step 4: stir evenly

Step 5: put sodium hydroxide into another container

Step 6: pour salt tea solution

Step 7: stir until sodium hydroxide is completely dissolved

Step 8: put duck eggs into the container

Step 9: inject the prepared solution

Step 1: cover the lid.