DO-AHEAD TIP: Marinate kabobs for 30 minutes (see recipe). If using bamboo skewers, presoak them in water for 30 minutes, to prevent burning on the grill
Preheat grill to MEDIUM. In a small bowl, whisk together first 7 ingredients (basil through black pepper) and set aside.
Alternately thread veggies onto skewers then place them in a shallow dish. Pour marinade over kabobs then cover and marinate for 30 minutes. Lightly oil the grill grate.
Remove kabobs from dish, shaking off excess marinade (reserving marinade) and grill over indirect heat for 7 to 10 minutes, turning every 1 to 2 minutes and basting with marinade, until cooked through.
Watch carefully to prevent burning! Serve over mixed baby greens then drizzle with a little more balsamic vinegar and garnish with Mozzarella cubes.