Go to the Article: How to Grill Vegetables and Mushrooms
spraying some oil on to the coals cause flare ups that add a bit of that classic BBQ flavour that grilled veggies tend to lack
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I was taught that to keep portabellos from getting too soggy, you scrape out the gills before cooking.
It comes from Steven Raichlen, and one of his cookbooks, but it is my GO TO veggie side. Do the tomatoes as you say, and then when you flip them, add some salt and pepper and some parmesan to the top. Let it melt, and it is so delicious.