Preheat the oven to 350°F (175°C) and line a rimmed baking sheet with parchment paper.
In a large bowl, whisk the egg white and vanilla until frothy.
Add the pecan halves and toss until each nut is coated in the egg-white mixture.
In a separate bowl, combine the granulated sugar, molasses, ground ginger, cinnamon, and salt. Stir until the molasses is evenly distributed through the sugar.
Pour the sugar mixture over the pecans and stir with a spatula until all pecans are evenly coated.
Baking
Spread the coated pecans in a single layer on the prepared baking sheet. Bake for 15-20 minutes, stirring once or twice during baking.
Watch closely the last 5 minutes to ensure the coating does not burn.
Remove from oven and let the pecans cool on the sheet until the sugar hardens, about 20-30 minutes.
Serving
Break apart any clusters and transfer to a serving bowl or package for gifting.
Notes
Store cooled pecans in an airtight container for up to 2 weeks at room temperature. For freezing, place in an airtight container for up to 3 months. They can be served as snacks, toppings for salads, or added to desserts.