Combine teriyaki sauce, soy sauce and garlic in 1-gallon resealable food storage bag. Pierce pork with fork. Add to teriyaki sauce mixture; turn to coat all sides. Marinate in refrigerator 30 minutes.
Heat oil in large skillet over medium-high heat until hot. Remove pork from marinade, place in skillet and cook 3 minutes per side or until pork is browned and reaches a center internal temperature of 160°F. Discard bag with marinade.
Remove pork from skillet and place on serving plate; keep warm.
Add snow peas, onion and broth to skillet. Stir in browned bits from bottom of skillet. Cook 5 minutes or until snow peas are crisp-tender. Place vegetables alongside pork. Serve with rice, if desired.