We bbq at home (on a Big Green Egg smoker grill) and then package the meat in meal-size portions and freeze them. When we camp, we take out a package, dump it in a nonstick skillet with a little bbq sauce, and then simmer for a few minutes. Very easy, and easy cleanup -- wipe the skillet with a used napkin before washing it.
Almost no water is needed to wash the skillet -- a few drops of Dr Bronner's soap on a wet paper towel, rub, and rinse in a dribble of water. (We boondock a lot, so water conservation is a big deal to us. The real problem is gray water capacity because we shower in the trailer.)
We also usually have tossed green salad -- my wife preps the lettuce at home and packs it in a plastic bag with wet paper towels to keep the lettuce fresh. She adds a few goodies at dinnertime, like cut up carrots and olives and red pepper. She dumps it all into a plastic bag, dumps in a little dressing, and dumps out the bag --nothing to wash!
This is accompanied by toast -- I make bread at home and we slice it up. We toast it on the stove, on a piece of metal that covers the grill. Nothing to wash. We even use popsicle sticks (get them at a craft store) to butter the bread. Just toss them --nothing to wash.
Breakfast is usually a four cheese omelette and salsa and toast and Danish pastry and Starbucks coffee. I make the coffee pour-over style -- a paper filter in a plastic basket that sits on a carafe. When the coffee is brewed, the filter and the grounds go into the garbage -- nothing to wash.
Once in a great while, we will go out for pizza. We both watch what we eat, and we try to watch salt and fat, so most restaurant food is not great for our health. But I do like a pizza, especially after a really long hike.