The best thing in the world I grill is simple:
2 red peppers
2 yellow peppers
1 sweet onion (1015 works best)
1 tablespoon of garlic
1 8 oz. pack fresh sliced mushrooms
Just toss it all in EVOO and stick it in your wok, and grill it.
I tend to drizzle it with EVOO every now and again.
Simple but oh, so good!