Marinade: In a small bowl, whisk together the olive oil, garlic, red pepper flakes, oregano, rosemary, and lemon zest.
Thread alternating pieces of chicken and grapes onto 12-inch skewers. Place the skewers into a nonreactive dish or pan. Pour the prepared marinade over the skewers, turning to coat each one. Marinate in refrigerator for 4 to 24 hours.
Remove skewers from marinade, and let excess oil drip off. Discard any remaining marinade. Season the skewers with salt. Grill on a hot barbecue until the chicken is cooked through, 3 to 5 minutes on each side. Arrange on a serving platter and drizzle with the lemon juice.
Makes 6 appetizer servings; 4 entrée servings.
Nutritional analysis per entrée serving: Calories 212; Protein 23 g; Carbohydrate 11 g; Fat 8 g; 34% Calories from Fat; Sat Fat 1.5g (7% Sat Fat); Cholesterol 63 mg; Sodium 347 mg; Fiber .6 g.
Nutritional analysis per appetizer serving: Calories 141; Protein 16 g; Carbohydrate 7.5 g; Fat 5.4g; 34% Calories from Fat; Sat Fat 1 g (7% Sat Fat); Cholesterol 42 mg; Sodium 231 mg; Fiber .42 g.