For zuchini and yellow squash, I like to: Wash, slice in chunks, add onion, bell peppers, some Mrs. Dash original (yellow top) or the maroon top (Italian?), or salt/pepper/garlic powder.....or some Italian seasoning (basil and whatever else is in there)..add a cup or so of water and some olive oil...... put it in a couple of layers of aluminum foil and throw it on the grill..... it'll be good in 20 minutes or so.