Preheat the oven to 250°F (120°C).
Line a baking sheet with parchment paper.
In a large bowl, whisk together the sugar, cinnamon, and salt.
Add the pecans to the bowl and stir until they are evenly coated with the sugar mixture.
In a small bowl, whisk together the egg white and water until frothy.
Add the egg white mixture to the pecans and stir until the pecans are evenly coated.
Spread the pecans out in a single layer on the prepared baking sheet.
Bake for 1 hour, stirring every 15 minutes, until the pecans are caramelized and toasted.
Remove the pecans from the oven and let them cool completely on the baking sheet.
Break the pecans apart and store them in an airtight container at room temperature for up to 2 weeks.