Cut pork crosswise into 12 pieces.
Place each piece between 2 sheets of heavy-duty plastic wrap; pound each piece to 3/4-inch thickness, using a meat mallet or rolling pin.
Combine sage, salt, and pepper. Sprinkle both sides of pork with sage mixture. Place a large nonstick skillet coated with cooking spray over medium-high heat. Add pork and cook 5 to 6 minutes on each side or until pork loses its pink color. Remove pork from pan, and keep warm.
Add jelly, vinegar, and ginger to pan. Cook over medium-high heat 2 minutes or until thick. Pour sauce over pork slices. Serve immediately.