Homemade canned tuna fish is a delicious and convenient way to enjoy the flavors of fresh tuna all year round. This recipe allows you to control the ingredients and customize the seasoning to your liking. The process involves cooking the tuna, packing it into jars with oil or brine, and then processing the jars in a pressure canner. The result is tender and flavorful tuna that can be used in sandwiches, salads, or pasta dishes.