Here is a site that tells you how to do it. Thought I had instructions in one of my cookbooks but couldn't find it. They can be truly delicious. Here in CA they are bags of them for sale in every supermarket with the potato chips and other snack foods. (Or do you call them crisps?)
If there are any Mexican markets in Manitoba you would find them there already cooked and usually quite fresh.
Otherwise I suggest you contact somebody in the U.S. to send you some next time you want them. A whole lot less work.
http://www.recipehound.com/Recipes/2198.html