I decided to take the time to "re-season" all of my cast iron cookware this morning (with the cooler weather here, I use it for more cooked foods), and reviewed the instructions at LINK:
http://castironcookware.com/cleaning-seasoning.html
Direction #9 about BEANS and TOMATOES in iron cookware (high acid when cooking) is worth noting, since many of us McDougallers sometimes use some of one or the other in our cooking of beans, soups, stews, casseroles, "burgers", etc.
Clear and easy to follow directions, with other hints, and a few useful recipes (some need to be McDougall-ized), and items to order (some at discount.)
RECIPES:
http://castironcookware.com/cookbooks-recipes.html