If your cast-iron cookware is covered with rust, here is a safe and easy way to remove it while preserving the cookware's finish. You'll need a lemon, salt and a bit of olive oil. First, cover the bottom of a small dish with table salt. Next, cut a lemon in half and dip it into the salt. Place the salt-covered lemon into the rusty skillet and rub in a circular pattern. Periodically re-dip the lemon into the salt. Once all the lemon juice has been drawn out of that half of the lemon, continue with the other half. Rinse the skillet with fresh water and place it on the burner to dry completely. Finish the job by applying a couple of tablespoons of olive oil with a soft dry cloth to the skillet. And that's the On The House tip for today.