Start by combining milk, lemon zest, and vanilla sugar in a bowl. Heat this mixture until it’s just about to boil.

In another bowl, whisk together the egg yolks, sugar, and cornstarch until smooth.

Gradually mix the hot milk mixture into the egg yolk mixture, stirring constantly to prevent the eggs from scrambling.

Once fully combined, let this mixture cool down completely.

After cooling, stir in the juice of 1 lemon and the sweetened condensed milk into the mixture.

Beat everything together until the mixture thickens to your desired consistency.

Now, let your creativity shine! Decorate your dessert with a sprinkle of cinnamon, a dusting of cocoa powder, or lavish it with chocolate shavings, according to your preference.