Wash good, then cut the ends off and cut the pieces in 1/2 or 1/4s
Always have your grill coals hot and turned to grey.
Lay them to the right and then without flipping over lay them to the left, if you want to create the diamond look. Then turn them over to the other side and do the same way.
oil the grates on your grill good
then you can use oil or butter and put what ever kind of seasoning (salt & pepper or garlic) you like on the vegetables.