Serious Eats: Talk
Slow Food Seattle: Tuna Canning
They are hosting a tuna canning class in early January for $10 for the class, and substantially more to keep a flat or two of the finished product. Wish I lived closer to go, myself.
Look them up online at SlowFoodSeattle(dot)wordpress(dot)com
It says it includes a secret ingredient in the canning process. Sounds like fun!