My first tour was ACA's unsupported Northern Tier tour in '99. 13 of us for 93 days. Except for the relatively few times we at out, two people would take turns cooking each night. I had never even seen a camp stove before the trip started. I asked to be in the last pair so I could observe what others did. Today, I am a great camp cook and actually enjoy the challenge of making dinners that involve more than opening cans and/or boiling water.
If you ride a lot each day, a pot of pasta ain't so bad, especially when grocery picking are slim. Get creative with what is available. Top it off with some bagged greens and dressing. Much more prevalent now than BITD. A couple of special "treats" I remember were quesadillas and fish filets. Thing is, the more complicated a meal the more time it's usually going to take to prepare. One day we planned our shopping poorly and ended up having omelets for dinner. There were basically only two frying pans appropriate for omelets so it took a while to feed everyone. Speaking of time to cook, post-ride snacks are usually welcome to tide people over. We went through a lot of bags of chips and jars of salsa. One woman liked to get a block of cream cheese, a jar of red salsa and a box of Trisquits. She'd put the block of cream cheese in the center of a pot lid that doubled as a pan and pout the salsa around it. Surprisingly good, with carbs, salt and fat. Hummus has grown in popularity since then, so that is another snack possibility.
Worst meal was probably in Rexford, WA. It was too long and hard of a day to carry groceries all the way from the town we left that morning, so we relied on what was available at the campground store. We had pasts with jarred sauce, canned peas and canned corn. At the hostel at Lake Itasca, which wasn't yet open for the evening when we arrived, we were forced to make do with brats and an industrial sized can of baked beans from a nearby store, which pretty much only had picnic-type stuff for people going to the park. The vegetarians, of course, were stuck with just the beans. On top of that, we had to cook/heat everything up on the hostel's outdoor grill under a tarp to keep us dry from the rain.
Keep in mind that if there are vegetarians in the group (We had 3 in our group.) the "base" meal will have to be vegetarian, but that does not mean you cannot have a side of meat that can be added. For example, I remember pasta with ground beef and veggies. The meat was cooked in a separate pan and had to be added to your own bowl containing the pasta with veggies.