1. Preheat grill to medium-high heat.
2. Skewer asparagus spears onto kabob sticks and place in a glass dish.
3. Mix vinegar, oil, garlic, salt and pepper.
4. Drizzle mixture over asparagus and marinate for about 30 minutes before grilling.
5. Grill for 4-6 minutes on each side or until nice grill marks appear.
Tip: To keep skewers from burning, soak skewers in water for 15-20 minutes before using.