I'm a big fan of foil cooking.
I went on a four-night camping trip in Arizona with some classmates from college a few springs ago, and by the last night we were all sick and tired of plain camp food, but we didn't want to truck everyone into town for dinner. So I suggested going to the grocery store and getting a roll of aluminum foil, some veggies and such and cooking over the fire. We all ate well that night.

The process is just as easy when backpacking. Place chopped peppers, onions, potatoes, or whatever vegetables you like in foil with pre-cooked sausage (works better than raw chicken or beef; less chance of undercooking it and getting sick) and stick it in the freezer. Wrap it in a blanket and stick it in your pack, it'll stay fresh until camp that night. All the work is already done; just drop the bundle on the fire and you're eatin' good!