Preheat grill on MEDIUM 10 min.
1. Clean grill with wire brush; brush lightly with vegetable oil.
2. Season all sides of zucchini wedges with salt and pepper to taste; brush with basting oil.
3. Grill zucchini 6 min, until tender, turning every 1-2 min and brushing with basting oil.
4. Transfer to serving platter; top with butter.