Mix the steak marinade ingredients in a small bowl. Cut up your beef and put in a shallow dish and cover with the marinade. Cover and refrigerate for 3 hours or overnight.
Marinate the vegetables in a simple oil and vinegar dressing while the meat marinates.
If you're using wooden skewers, soak in water at least half an hour before cooking.
Thread the meat and vegetables on the skewers and cook on the grill 8-12 minutes, depending on how well you like your meat done.