In a small bowl, mix brown sugar, mustard, and pepper.
When turkey has about 45 more minutes to cook (breast temperature at bone will be about 135 for birds up to 18 lb., about 145 for birds over 18 lb.), spread with half the glaze.
Cook 20 minutes.
Brush with remaining glaze. Continue to cook until the meat thermometer registers 16
If glaze gets too dark, drape dark areas with foil.
