Looks close to Spam, which is popular here in the US.
You can slice it and fry it in a pan, or over open fire to get it hot, then place it on a bun and make a sandwich/burger. Add some lettuce, pickle, ketchup, or whatever you prefer/can carry.
From the wikipedia article about Bully Beef:
Bully beef and hardtack biscuits were the main field rations of the British Army from the Boer War to World War II. It is commonly served sliced in a corned beef sandwich.
Dicing it and scrambling with eggs and diced potato (canned potato's work best since they're already soft) is also good. Also, just cooking slices and eating with fork and knife like a slab of meat is pretty good too.
Dicing it into cubes and tossing into a pot of Marconi & Cheese is also another common way to enjoy it.