Combine orange juice concentrate, wine, mustard, and ginger.
Slash fat edge of ham slice.
Brush sauce over ham.
Grill over medium coals for 10 to 15 minutes, brushing with sauce occasionally.
Turn ham and grill till done, 10 to 15 minutes more, brushing with sauce.
Grill pineapple slices alongside the ham, brushing frequently with sauce.
Place pineapple atop ham during 1 ast 5 to 10 minutes of grilling.
Garnish with orange slices, if desired