In a medium saucepan, combine the water and sugar over medium heat. Stir until the sugar has completely dissolved.
Add the rhubarb ribbons to the saucepan and bring the mixture to a gentle simmer.
Cook the rhubarb for about 5-7 minutes, or until it becomes tender but still holds its shape.
Remove the saucepan from heat and stir in the vanilla extract and salt.
Let the rhubarb cool in the syrup for at least 30 minutes.
Once cooled, carefully remove the rhubarb ribbons from the syrup and place them on a wire rack to dry for about 1 hour.
Store the candied rhubarb in an airtight container at room temperature for up to one week.