Preheat oven to 250°F. Line an extra-large sheet pan (or 2 smaller sheet pans) with parchment paper or a silicone baking mat and set aside.
Measure sugar, cinnamon, and salt into a large bowl. Stir to combine.
In another bowl, whisk egg whites, vanilla, and water together until frothy. Toss pecans in the egg white mixture, then use a slotted spoon to remove and transfer them into the bowl with the sugar mixture. Toss the pecans in the sugar mixture until well coated. Spread coated pecans onto a baking sheet and keep them from overlapping.
Bake in the preheated oven, stirring every 15 minutes until pecans are evenly browned, about 45–60 minutes. Let stand for 30 minutes or until fully cool and solidify.
Notes
Note 1: I like 1 cup of granulated sugar and 1 cup of light brown sugar, but feel free to use 2 cups of either.Nutrition: The nutritional information is calculated for a 2-ounce serving.Storage: Store in an airtight container and freeze up to 2 months.