Combine brown sugar, curry powder, 1/4 teaspoon salt, and red pepper; rub over turkey.
Place a large nonstick skillet over medium-high heat until hot. Add pecans, and cook 3 minutes or until lightly browned, stirring constantly. Transfer pecans to a small bowl.
Coat pan with cooking spray. Add turkey; cook 2 minutes on each side or until done. Transfer turkey to a platter, and keep warm.
Add onion and 6 tablespoons chicken broth to pan. Cook, uncovered, 2 minutes, stirring constantly. Stir in plums, remaining chicken broth, 1/4 teaspoon salt, and pecans. Cook 2 minutes or until liquid is nearly absorbed. Spoon mixture over turkey; cover and let stand 5 minutes.
Serve turkey mixture over couscous. Top each serving with chutney, if desired.