In a large bowl, use electric mixer or whisk to beat the egg white until foamy (30-40 seconds with mixer).
Add sugar, brown sugar, cinnamon, allspice, salt, cayenne (if using), vanilla and water; mix until well combined (15-20 seconds with mixer).
Stir in pecans until all are well coated with the mixture.
Pour onto baking sheet and spread out nuts into a single layer.
Bake for a total of 40 minutes; removing pan after 20 minutes, flipping nuts over with a spatula and rearranging pecans into a single layer before returning to oven for last 20 minutes.
Remove from oven and allow to cool completely, break apart, and transfer to airtight container;