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