Combine turkey tenderloin, all-purpose flour, salt, and pepper in a large zip-top plastic bag; seal and shake to coat. Heat oil in a large nonstick skillet coated with cooking spray over medium-high heat until hot. Add turkey mixture, and stir-fry 3 minutes or until lightly browned. Remove turkey mixture from skillet. Set aside, and keep warm.
Wipe skillet with paper towels, and recoat with cooking spray. Place skillet over medium-high heat. Add bell pepper, shallots, and ginger; stir-fry 1 1/2 minutes. Add nectar and remaining ingredients; bring to a boil. Cook over medium heat 3 minutes or until slightly thick. Return turkey to skillet, and cook 1 minute or until thoroughly heated.