Whisk egg white until foamy; stir in pecans, coating well. Stir in sugar; coat well. Spread pecan mixture evenly in a lightly greased 15- x 10-inch aluminum foil-lined jellyroll pan.
Bake at 350° for 10 minutes. Stir gently with a wooden spoon; bake 8 to 10 more minutes or until sugar is light golden brown. Remove from oven, and cool completely in pan. Store in an airtight container; freeze, if desired.