1. Preheat oven to 275°F.
2. With an electric mixer,beat egg white until stiff peaks form.
3. Add the sugar and vanilla and mix until thoroughly incorporated.
4. Line a cookie sheet with wax paper.
5. Put pecans on an even layer on the sheet.
6. pour mixture over pecans and stir to coat.
7. Cook 15-20 minutes until coating has hardened.
8. Put on plate to cool.
9. Store in airtight container.