Pineapple Sirloin Skewers

1 can pineapple chunks
6 tablespoons soy sauce
2 tablespoons brown sugar
2 tablespoons vegetable oil
2 teaspoons ground ginger
1 teaspoon minced garlic
1/2 teaspoon pepper
1 pound boneless beef sirloin steak, cut into 1 inch cubes

Drain pineapple, reserving the juice. Refrigerate the pineapple. In a small bowl, combo the juice, soy sauce, brown sugar, oil, ginger, garlic, and pepper. reserve 1/3 cup marinade for basting and 1/3 cup for serving. Cover and refrigerate. Pour remaining marinade into large Ziploc bag; add beef cubes. Seal bag and turn to coat; refrigerate for 8 hours or overnight. Drain and discard marinade from beef. On metal or soaked wooden skewers, alternate threading beef and pineapple chunks. Grill, uncovered, over medium heat for 5 minutes on each side or broil 4-6 inches from heat until beef reaches desired doneness, basting frequently with a portion of the reserved marinade. Serve with remaining marinade.