You'll need:
Approx 12 small limes
4 cups of water
1 cup of sugar
Makes approx 4 servings
First, wash the limes really well because you will be blending part of the peel in with all the rest. I used about a dozen small limes, but you can adjust up or down depending on how much you want to make.
Next, peel any brown or tough spots off of the limes, leaving about half the peel. Cut them in half and stick them in a blender (I used a food processor instead). Add 4 cups of water and 1 cup of sugar and blend for about 5 seconds. Don't blend it too much. It's supposed to still have some chunks.
Finally, pour it through a strainer into a pitcher and serve. You may need to do some good counter-scrubbing afterwards because any spills get really sticky...
