canned meats work well:
Roast Beef Chicken Breast Tuna Dried Beef (salted)
SPAM (comes in different flavors) Ham Vienna Sausages
Potted Meat Deviled Ham Chili (with or without beans)

There are "C-ration" types such as the before mentioned Dinty Moore Beef Stew but also Sweet Sue has Chicken and Noodles and Chicken and Dumplings and some others. There are also Ravioli, Spaghetti and Meatballs, and other Chef canned products.