Place flour, garlic salt and pepper in lg plastic resealable bag. Shake to mix. Add pork slices and shake to coat.
Heat oil in lg skillet over med-high heat. Cook pork in oil until golden brown on all sides. Pour in the vinegar and broth.
Bring to boil. Reduce heat to medium. Simmer 4-5 mins, or until pork is no longer pink. Remove pork to serving platter. Stir lemon zest into pan. Simmer until slightly thickened. Pour sauce over pork slices.