What is the method of making small egg yolk cookies?

Required materials: 4 egg yolks, 30 grams of milk powder, 20 grams of sugar, 2 drops of lemon juice

1, first of all, prepare the egg yolks needed, as shown in the picture below:

2, and then add sugar, as shown in the picture below:

3, and then add the lemon juice, as shown in the picture below:

4, and then beat, as shown in the picture below:

5, beat until the mixer picks up the foam does not immediately disappear, as shown in the picture below:

6, add milk powder, as shown in the picture below:

5, beat until the mixer to pick up not foam will not immediately disappear, as shown in the following picture:

6, add milk powder, as shown in the following picture:

7, and then put into the labeled bag, as shown in the following picture:

8, and then squeezed in the baking dish, as shown in the following picture:

9, on the oven at 140 degrees for 20 minutes, as shown in the following picture:

10, When the time is up, take out and serve, as shown below: