While cooking you will absorb the iron and consume it as more iron. This works especially well with acidic foods such as tomatoes. Spaghetti is an excellent dish to cook in these dishes to add additional iron. This is very helpful if you are a vegetarian. Vegetarians consume less iron because they obtain it from plant sources.
Plants contain chemicals that bind the iron making it unable to be absorbed.
You can still obtain iron from vegetables. Foods such as beans, whole grains, spinach, and dried fruits have a significant amount of iron. Eat more red meat. It has a significant amount of iron in it. It fat is a reason you don't consume it try eating lean or extra lean meat.