In small bowl, combine olive oil, balsamic vinegar and Italian herb seasoning; set aside. Cut each sausage into six slices. Thread on skewers, alternating with grapes and onion.
Preheat grill to medium-low heat.
Place oiled piece of foil on grill and top with skewers. Grill 5 minutes, or until grapes are softened and sausage and vegetables are lightly browned, turning and basting with balsamic vinegar mixture occasionally.
Transfer to platter and garnish with snipped fresh basil, if desired.
Note: If using bamboo skewers, soak at least 1 hour in water to avoid burning.
Notes
Nutritional information per serving: 170 calories; 9 g protein; 11 g carbohydrates; 10 g fat (53% calories from fat); 2.5 g saturated fat (13% calories from saturated fat); 55 mg cholesterol; 470 mg sodium; 2 g fiber.