Step 2: Add fine sugar when the protein is beaten until it is coarse, and continue to beat until it is close to hard foaming, as shown in the figure, and the sharp corners are slightly curved.

Step 3: Pour in the egg yolk and stir well.

Step 4: Add corn oil and mix well.

Step 5: Add milk and mix well.

Step 6: Add lemon juice and mix well.

Step 7: Add lemon juice and mix well.

Step 8: Add black sesame seeds and mix well.

Step 9: Pour the mold into the mold for nine minutes, shake it a few times and shake out big bubbles.

Step 10: Put it in a preheated oven, and fire at the middle layer 175 degrees for about 30 minutes.