I feared my aunts’ cherished recipe had vanished, but fortunately, I rediscovered it, and it’s even tastier now!
In a medium saucepan, whisk together the sugar, cornstarch, and water over medium heat until smooth.
Stir in the lemon juice and zest. Cook for about 5 minutes, stirring frequently, until the mixture thickens.
Remove from heat and slowly whisk in the beaten egg yolks. Return to heat and cook for another 2 minutes.