01 - Set oven to 300°F and line a large baking sheet with parchment paper or a silicone baking mat.
02 - Combine granulated sugar, ground cinnamon, and fine sea salt in a medium bowl; set aside.
03 - In a large bowl, whisk egg white, water, and vanilla extract until frothy.
04 - Add pecan halves to the egg white mixture and toss to ensure even coating.
05 - Sprinkle the prepared cinnamon sugar over the coated pecans and toss until fully covered.
06 - Spread the nut mixture evenly in a single layer on the prepared baking sheet.
07 - Bake for 30 minutes, stirring the pecans every 10 minutes to promote uniform roasting.
08 - Remove from oven and allow pecans to cool completely on the baking sheet; the coating will crisp as they cool.
09 - Once cooled, transfer pecans to an airtight container for storage.