You can try eating an orange after your roast beef dinner, which will help increase your chances of absorbing the maximum amount of iron from your meal. Now of course oranges tend to be everyone's source of vitamin C, but what else can we eat to increase our vitamin C content? Try any of the following fruits for a change, papaya, bell peppers, broccoli,kiwi,strawberries,grapefruit,Brussels sprouts,orange,snow peas and grapefruit juices,and juices fortified with vitamin C.