As you may have gathered from other places, most fresh meat is edible to someone even with the list of intolerances in my header!
As a rule, tinned meat is also ok. I can vouch for tinned tuna, spam, and that potted ham stuff.
One thing you do have to be careful of, though, is if you were ever a fan of those tinned/jarred hot-dogs that are basically plastic. Some brands are fine, while others contain (you guessed it!) citric acid.
I'm not sure what else there is to say on that one. If it is fresh you know you're safe.
If you are buying fish, though, be careful they have not already added garlic butter to it (some brands of margarine and butter contain citric acid) and that they have not added lemon!
Extra note: be careful of your gravy! The red and yellow bisto are safe, but you really need to check the packets as many are not.
And if you're serving up a joint, the cranberry sauce is out I'm afraid, as is anything lemon (obviously). I'm unsure about bread sauce, as I never liked the stuff. Apple sauce is ok if you made it yourself but many supermarket brands add citric acid to help it keep longer. As I said, check the label.