I N S T R U C T I O N S
take 8 underripe dark green limes, zest them (perfect job for a Microplane Zester...).  Add the zest to a quart of water and steep for at least one hour.  Strain the mixture though cheesecloth or a fine sieve making sure to press on the solids to extract as much juice as possible. Add sugar to taste (about 3/4 to one cup) chill and serve in tall glasses over ice. 

Other Uses
You can use the limeade to make margaritas or freeze the mixture in ice cube trays and pop into drinks.

This drink mixes well with vodka for a refreshing cocktail.