The hairs on the undersides of the leaves contain a histamine, which causes a burning sensation or stinging when touched, so handle nettles with tongs or gloves.  The "stinging" is neutralized by either pureeing or cooking.

We love to make a basic pesto with other herbs for additional flavor or add it into an omelet. 

Many people like to add them to smoothies or at the end of a stir fry. 

If you puree them, make sure that you process until smooth. 

You can also make a fresh tea by pouring boiling water over the minced up herb.  Add mint or bee balm for flavor.  Great for pregnant or nursing mamas.    

-Holly of Against the Grain Farm, who brought the wild-harvested nettles 

Find more ideas and recipes online, here is a place to start: http://www.thekitchn.com/stinging-nettles-8-recipes-for-145582