Beet greens are rich in iron and in general nutritious. In spring you will see fresh beetroot with greens at farmers market and grocery stores too. Walmart also has it. Beet greens I like to use immediately and then store beetroot.
Today I chopped beet greens and added to left over mung beans. Added some lemon juice and it made nice soup for lunch on a rainy day.
If you are looking for vegetarian iron sources , try to add beet greens and beetroot to your diet.