MIX dressing and soy sauce until blended.
STIR-FRY meat and garlic in 1 Tbsp. dressing mixture in large nonstick skillet on medium-high heat 3 min. or until meat is barely pink in center. Transfer to plate; set aside.
ADD peas, peppers and remaining dressing mixture to skillet; stir-fry 3 min. or until vegetables are crisp-tender. Return meat to skillet; stir-fry 1 min. Remove from heat; stir in tomatoes and cilantro. Serve over spaghetti.