Heat remaining dressing in large skillet on medium-high heat. Add shrimp, ginger and garlic; stir-fry 3 min. or until shrimp turn pink. Add bok choy; stir-fry 2 min. Add peas and onions; stir-fry 2 to 3 min. or until crisp-tender. Stir in soy sauce mixture; bring to boil, stirring constantly. Simmer on medium heat 1 to 2 min. or until thickened, stirring frequently.