Combine orange juice concentrate, wine, mustard, and ginger; brush over ham.
Grill over medium coals for 20 to 30 minutes, turning once and brushing with sauce occasionally.
Grill pineapple slices alongside the ham, brushing frequently with sauce.
Place pineapple atop ham during last 5 to 10 minutes of grilling.
Garnish with orange slices, if desired