It’s not that simple. Cast iron pans when properly seasoned won’t leach much iron into the food. However, I recall reading about a group who brewed their beer in iron kettles. And it was found to be a significant source of iron, as a result.
And beer itself for various reasons enhances iron absorption.
Can licking an iron bar get you the daily recommended amount of iron?
How many licks would it take? Can the iron in bars even be processed by the body? Can you do this for other minerals?