[etcetera]

" Never cook things like tomatoes or other high acid foods in cast iron. The food will come out tasting real funky, and the acid from the tomatoes (or whatever) sure won't do the cast iron any good"

Hmmm...is that why "cowboy" beef stew doesn't have tomatoes in it?

[gnarledmaw]

"Never cook things like tomatoes or other high acid foods in cast iron."

If acids cause problems, your pan is just still too young. When the coating gets thick enough you can cook acids without a problem.