Open the container of liquid crème fraîche and keep it within reach.
Pour the sugar into a saucepan and moisten it with the amount of water listed in the ingredients (about one-third of the sugar’s weight).
Be careful not to stir the sugar so that the sides of the saucepan remain clean. Otherwise, the caramel will tend to burn and harden.
You can add a few drops of lemon juice to further prevent the caramel from hardening.