How to make French fries in cast iron skillet in a griddle. Today we are making french fries in a cast iron skillet on the griddle.If I’m griddling burgers, then I’m also making fries. And I definitely don’t want to be going back and forth from the griddle on the porch to the kitchen to cook fries, so I just put my cast iron skillet right on my griddle and cook my fries there. It’s convenient to have everything I’m cooking for the whole meal right in front of me. I put my skillet off to the left