Place bok choy in a vegetable steamer. Steam, covered, 6 minutes or until tender. Set aside; keep warm.
Pat fillets dry with paper towels; sprinkle with salt. Combine flour, five-spice powder, and pepper in a shallow dish, and stir well. Dredge fillets in flour mixture, and shake off excess flour.
Heat 1 teaspoon oil in a large nonstick skillet coated with cooking spray over medium-high heat. Add 2 fillets to pan; cook 3 to 4 minutes on each side or until fish flakes easily when tested with a fork. Remove fillets from pan; keep warm. Wipe pan clean with paper towels. Repeat procedure with remaining 1 teaspoon oil and fillets.
While fish cooks, combine water and cornstarch in a small saucepan. Add lime juice and next 4 ingredients; bring to a boil, stirring constantly. Cook 1 minute or until thick, stirring constantly. Serve fillets over bok choy; drizzle with glaze, and sprinkle with green onions.