Lemon Chiffon Pie Filling

Procedure

1. Dissolve the sugar in the water and bring to a boil.
2. Beat together the egg yolks, second quantity of water, cornstarch, sugar, and zest until smooth.
3. Gradually beat the boiling syrup into the egg yolk mixture in a thin stream.
4. Return the mixture to the heat and bring it to a boil, beating constantly with a whip.