Put the sugar in a pudding pan and melt it over low heat until it has a caramel colour.

Mix condensed milk, milk, eggs and yolk in a blender. Pass the blender mixture into the pudding pan through a sieve. Bake in a water bath at the oven at 350 Fº for 1 hour and 30 minutes. Let rest in the fridge overnight. To unmold, warm for one minute before turning it over on a plate.