How to make
Beat the yolks that you have separated with both types of sugar. Add the flour in thin streams while stirring vigorously.
Add the milk in the same way. Finally, add the grated lemon peel and rum. Mix everything and transfer it to a pot. Let it simmer for a while on low heat.
Meanwhile, keep stirring. As soon as the mixture thickens, the cream is ready.
This egg custard can be used in the preparation of a variety of pastries.