Step 2:
Whip the eggs until they are a thick and fluffy froth.
Start beating the eggs without sugar, and when the foam starts to form, add sugar in 2-3 steps.
It may take some time, but you need to keep beating until you have a lush, dense, light-colored froth.
Some recipes whip the eggs in a water bath, but in my experience, you can do without this construction.