Dissolve 1 cup white sugar over moderate heat to caramelize it.
Pour evenly on bottom and sides of molder. Set aside.
Preheat oven to 375 ° F. In a mixing bowl, combine egg yolks and whole egg.
Add 1/2 cup sugar, lemon rind and milk.
Mix thoroughly but gently so as not to form air bubbles.
Pour into prepared caramel-lined pan.
Put the pan in a large, shallow baking pan containing water.
Bake in the oven for 45 minutes.