MIX dressing and soy sauce.
HEAT large nonstick skillet on medium-high heat. Add steak strips, garlic and 1 Tbsp. dressing mixture; cook 3 min. or until steak is barely pink in center. Transfer to plate; set aside.
ADD sugar snap peas, yellow pepper and remaining dressing mixture to skillet; cook and stir 3 min. until vegetables are crisp-tender. Return steak to skillet; stir-fry 1 min. Remove from heat; stir in tomato and cilantro. Serve over hot cooked pasta.