Combine the brown sugar, salt, cinnamon, and water in a skillet over medium heat. Cook for 1 to 2 minutes, stirring, until the sugar dissolves and the mixture bubbles.
Add the pecan halves and cook for 3 minutes, stirring continuously so every pecan is coated in the glaze.
Remove the skillet from the heat and spread the pecans in a single layer on parchment paper.
Let the pecans cool completely, then break apart any clusters and serve.
Notes
Cool the pecans completely before storing so the coating sets and stays crisp.