Preparation:
1. Cut beef into 1" cubes. Mix oil, vinegar, garlic, herbs and seasonings together in a glass dish. Stir in beef cubes, coating all surfaces with mixture, cover and marinate in refrigerator for several hours (2-12).
2. Cut peppers into 1" cubes; cut onions into small wedges.
3. Alternate beef and vegetables on 4 skewers, leaving a small space between pieces of food. Liberally brush each kebab with marinade and then discard marinade. Grill kebabs over medium coals about 4" from heat source.
4. Grill for 8-10 minutes turning skewers every 2-3 minutes. Or cook in a preheated broiler, 4" from heat.
5. Cook until beef is cooked through and vegetables are tender. | 