4 tablespoons orange liqueur or 4 tablespoons
Stir together preserves, ginger, liqueur and butter, simmer in a small saucepan until butter is melted.
Place pork cubes in heavy plastic bag, pour 3/4 cup apricot mixture over to coat. Marinate at least 30 minutes. Thread pork onto 4-6 skewers that have been soaked in water for 60 minutes, grill over hot coals 10-12 minutes, turning occasionally and basting with marinade.
Heat remaining apricot sauce to boiling and serve alongside kabobs.