This was actually a very easy dish to prepare and grill. I used oregano in place of marjoram.
From EatingWell: July/August 2008
We gave this classic Provençal dish a taste of summer by grilling the vegetables traditionally used in ratatouille (bell pepper, eggplant, zucchini, tomato). Topped with grilled chicken, it makes an easy main course for summer entertaining. We like fresh marjoram and basil to complement the flavors, but any fresh herb will work. Serve with polenta and a glass of Pinot Noir.