Best answer there is to go to Walmart or large supermarket and walk the "canned meats" isle. This type of packaging is getting to be more and more common.

You can buy several types of rice/pasta dishes that you microwave for about a minute in the pouch and eat. I have found precooked hamburger meat in pouches. (I tried that thinking it might be good for camping, but smell and texture reminded me of dog food.)

One thing that I have found that is very nice for camping is precooked bacon. It comes in a sealed clear pouch and can be stored without refrigiration. Shelf life is 4-5 months (check date on package). Less than a minute in a pan or on a stick over the fire will warm it up. Also, real bacon bits in a 3-4 oz pack can add a lot of flavor for a little weight on a backpacking/camping trip. (Really improves the taste of instant grits.)

The main reason I have paid so much attention to such food is that I am lazy, but I like to eat well on camping trips. On camping trips, food that does not require a cooler and ice makes things much easier. Precooked requires less fuel and less prep time. These foods make it easy to pack light.

On my last camping trip I baked a ham in a cast iron dutch oven. Took over 3 hours. I enjoy traditional campfire cooking, but it is a good idea to have quick and easy backups even when you plan to spend the time to do the real deal.