Scrub potatoes to remove any dirt. Prick all over with a fork. Micro-cook the potatoes on high for 8 to 10 minutes, or until the potatoes are fork tender but firm. Combine the honey, wine, garlic, thyme, salt, and pepper in a small bowl and mix well. Brush the vegetables with the honey marinade. Place the vegetables on skewers, if desired.

Lightly oil the grill rack with vegetable oil. Heat the grill until the coals are somewhat gray with ash; the flame should be low. Place the skewered or loose potatoes, zucchini, eggplant, green pepper, red pepper, and onion directly on the greased grill. Grill the vegetables for about 10 minutes, brushing them with the honey marinade every few minutes and turning them after 5 minutes.