Mediterranean Grilled Vegetables  

1 pound Large onion
1 pound Red bell pepper
1 pound Green bell pepper
1 pound Yellow squash
1 pound Zucchini squash
1 cup Olive oil
1/3 cup Italian seasoning

Peel onions and cut top-to-bottom in large wedges. Cut tops from bell peppers, remove core, and cut in large top-to-bottom pieces. Trim ends  from squash and cut in diagonal rounds, about 1/2" thick. Toss all  vegetables in a large bowl with olive oil and seasoning, breaking up the onion wedges somewhat. Place in a single layer on a very hot grill and grill, turning occasionally, until peppers
are slightly charred and veggies are tender (about 5 minutes).
Serve immediately.

Do use a grilling pan they will fall through the grids.