In reply to girlymonkey:
I'd agree that it's important to have stuff that the group will actually eat. I might be tempted to suggest they bring along say a couple of snacks (chocolate bars, etc) each for each day, so at least you're certain that they'll have something they like and will eat.
I suspect you can get away without eating much on a day on the hill with a group is that you're likely working at an effort well within your fitness. Don't forget that the group might well be pushing themselves way beyond what they're used to, which'll not only be a shock, but tend mean they deplete all their muscle glycogen and need lots of carbs to replenish (I now wait to be shot by those with a better knowledge of nutrition!). Plus, many people rarely get to the point of actually feeling truly hungry, so that in itself is a shock.
Couscous is great, pasta might be more acceptable to many. Whilst it does need longer cooking, it doesn't need to actually be on the boil the whole time - so you can bring to the boil, take off heat, leave 10 min, boil again for few min. You can either turn the stove off in the middle, or boil another lot of water for hot drinks (hot chocolate being good for extra calories).