In large bowl combine soy sauce, oil, corn syrup, garlic, dry mustard, and ginger.
Add meat; cover and refrigerate several hours or overnight.
Drain meat, reserving marinade.
Alternate meat, green pepper, and tomato on skewers.
Grill over medium-hot coals till desired doneness; allow about 15 minutes for rare.
Baste the kabobs occasionally with reserved marinade.