Answer:
You must start with cooked tripe. It takes 12 hours to cook (boil) or you can buy it already cooked. You can simply pickle it with a regular pickling recipe, but the quick way to do it is to make a marinade with half broth (from cooking it) and half vinegar and soak it for several hours.
More tripe pickling information:
http://www.astray.com/recipes/?show=About%20tripe