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