1. 1. Preheat the grill to medium-high heat.

2. 2. Cut the zucchini, summer squash, and bell pepper into slices.

3. 3. Cut the broccoli into florets and slice the celery.

4. 4. Place all the vegetables in a large bowl and drizzle with olive oil. Season with salt and pepper, and toss to coat.

5. 5. Grill the vegetables for 8-10 minutes, turning occasionally, until they are tender and slightly charred.

6. 6. Remove from the grill and serve hot as a delicious side dish or over cooked quinoa for a complete meal.