Sprinkle turkey with lemon pepper. Place turkey breast halves, meaty sides down in a 5 quart crock pot. Cover and cook on high for 1 hour. Reduce heat to low and clook for 5 hours. Remove turkey to platter, reserving cooking liquid in cooker. Set turkey aside and keep warm.
Combine flour and water in a saucepan , stirring with a whisk unti blended. Gradually add reserved cooking liquid, stirring constantly. Bring to a boil over medium high heat, stirring constantly. Reduce heat and simmer for 3-5 minutes or until thick, stirring ocassionaly.