1.   Fold whites into batter.

2.   Fold beaten whites into batter.

3.   Fold the whites into the batter, then fold in the chopped watercress.

4.   Fold the whites into the batter.

5.   Fold the whites into the yolk mixture until the mixture is all one color.

6.   Gently but thoroughly fold the whites, a third at a time, into the batter.

7.   Gently fold whites into batter.

8.   Gently fold remaining whites into puree.

9.   Gently fold whites into yolk mixture.

10.   Gently fold the whites into the yolk mixture.