Here's the search result for foods highest in Iron: http://nutritiondata.self.com/foods-000119000000000000000-w.html 1. Thyme
2. Parsley
3. Spearmint
4. Marjoram Herbs and leafy greens are warehouses of nutrition. Beef is 31st on the list. The idea that meat is highest in iron is another diet myth. If that was the case where would herbivores get their minerals from? As a general rule the darker the leafy green the higher in nutrition. But of course the condition of the soil in which the plants are grown is crucial. Industrial agriculture grown vegetables, where farmers routinely add just 3 (N-P-K) elements to the soil for decades (to purely aid the growth) will not be as nutritious as grown in organic compost made up of a holistic cocktail of nutrition. What I'm trying to say is that vegetables are only as nutritious as the soil they are grown in. But this is another discussion. To answer your question, I'd point to this video by Dr Greger http://nutritionfacts.org/video/the-safety-of-heme-vs-non-heme-iron/ The whole http://nutritionfacts.org website is an excellent nutrition resource.