Beet greens are the green, leafy portion of the beet is. Selected beet greens should be bulbs that are unmarked, avoiding those with overly limp leaves or wrinkled skins, both of which are signs of dehydration (Wikipedia, nd).
Since beet greens are a part of the beet, similar allergic reactions may occur if you already are allergic to the ingredient. In the event of an allergic reaction after consuming beet greens, contact your allergist.
Beet greens are most commonly served boiled or steamed, in which case they have a taste and texture similar to spinach. They can be used as a garnish, served in soups, or mixed into dishes (Wikipedia, nd).
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Here are some easy steps to follow when preparing beet greens.