Wash the eggs thoroughly.
Place the eggs and water in a pot and boil for 10 minutes.
Cool the boiled eggs in cold water and peel the shells.
Mash the eggs finely.
In a bowl, combine the mashed eggs, unsweetened cocoa powder, milk, and sweetener, and mix well.
Heat the mixture in a small saucepan over low heat while stirring.
Pour into a wide container and chill in the refrigerator for at least 1 hour until set.