Disclaimer: I did not have planks, so I used a grill pan. Also, I refuse to use frozen spinach when I can help it, so I used beautiful fresh baby spinach. I found this dish barely-edible and my significant other (who is a self-proclaimed human garbage disposal) couldn't even finish his. Totally underseasoned and bland and the zucchini took FOREVER to cook through on a grill pan. I can't imagine it being that different on a grill, though I could be wrong. Waste of good farm-fresh zucchini =(
Made for a weeknight dinner with friends; served with chicken. Did not use spinach; substituted diced red pepper for some color. Lost some of the couscous mixture on the grill. Watch the zucchini, I burned several on the bottom. A great way to use those large garden zucchini!