4 juicy limes (try and find ones with thin, smooth skins; they're the juiciest and the thin skin cuts down on the chance of your drink being bitter)
1 c. sugar
6 c. cold water
6 Tbsp. sweetened condensed milk
Put ingredients in blender, using 31/2 of the limes (save the rest for garnish). Blend well. Strain through a fine strainer. Serve immediately over ice.