Easiest thing in the world, and a great side for steak, grilled lamb and fish, or burgers. I like to do it on the grill, burning wood, but of course gas, charcoal, or even the oven work fine too.
Slice whatever you want of these things into approx 1/3-1/2" slices:
Yellow summer squash
Zucchini
Eggplant
Red onion
Potato
Finocchio (fennel)
Asparagus (whole)
Peppers (chunks)
Mushrooms (whole)
Scallions (whole)
Canned or pickled artichoke, or those mini-artichokes (cut in half)
Toss all in a bowl with olive oil, plenty of salt and pepper, dried Basil. Then bake or grill until they seem right. Each type of item might require different cook times. The burnt bits are delicious. Serving at room temp. is fine.