Barbecued Portobello Mushrooms

I found this recipe in Caldwell Esselstyn's Prevent and Reverse Heart Disease.  I love mushrooms and haven't had any in months, but Sameer hates them and insists they smell like fish, so I'm only making this a small portion of our meal when I make it.  It will probably be one of those special dinners that involves several dishes and takes several hours to make and isn't very good at all.  But at least we will have tried some new things, and I do miss mushrooms.

Ingredients
3-5 portobello mushrooms
barbecue sauce without oil or high-fructose corn syrup (or mix balsamic vinegar and no-oil tomato sauce instead)

Directions

1. Preheat oven to 350 degrees F.

2. Cover mushrooms with barbecue sauce and place flat or slightly overlapping in a casserole dish. Add a small amount of water to pan.

3. Bake for at least 30 minutes -- longer, if mushrooms are large.  They must be soft.

4. Before serving, cover each mushroom with pan juices.

Note from original recipe:  These mushrooms are amazingly like meat. Serve with a grain, steamed vegetable, and a salad or put mushrooms on top of rice in a bowl, drizzle pan juices over rice, and surround with steamed or uncooked spinach.  You may also put a barbecued portobello in a whole grain bun, or just use whole-grain bread. Add sliced tomato and lettuce and no-tahini hummus -- or roasted red peppers, cilantro, and spinach. 

[Edited 5/16/13:  These were inedible, primarily because I used a barbecue sauce that ended up being so obscenely spicy I only ate half of a mushroom and then threw the other three away.  It claimed to be the "smoky" variety of a gourmet sauce that came in smoky, mild, and spicy -- I think it was called Two Fat Guys.  I chose it because it was produced locally.  Just awful.  Anyway, I've made really good portobello mushrooms before with olive oil and garlic and balsamic vinegar and a few other things, and I think they were broiled, or at least cooked well over 350 degrees (which turned out chewy, undercooked mushrooms after 40 minutes), so I'll just find that recipe and never bother with this one again.  "Put barbecue sauce on mushrooms and cook them at a low temperature forever" is just a stupid excuse for a recipe anyway.]