Preheat the oven to 300 degrees. In a medium size bowl, combine the sugar, cinnamon and salt. Stir and set aside. In a large bowl, whisk the egg white until frothy. Add the vanilla and then whisk to combine.
Add the pecans and toss well to coat. Pour the sugar mixture over the coated pecans and toss well to coat thoroughly with the mixture.
Spread the nuts across a silpat or parchment lined (if using parchment, grease it lightly with butter) baking sheet. Roast for ten minutes, remove from the oven and stir well. Roast another five minutes, remove from the oven and stir again.
Let cool completely before storing in an airtight container. Enjoy!