PREPARATION
Scrub limes clean with soap and a brush or rough side of a sponge. Some limes have a waxy coating, you want to make sure this is scrubbed off because we’re using the peel.
Cut off the ends of all 4 limes and then roughly chop, leaving the peel on.
Add half the limes, half the water ,and half the sugar to a blender or large food processor. Blend for about 10-15 seconds.
Using a mesh strainer, strain the blended mixture into a pitcher. Discard the strained pulp.
Repeat process with the second half of the ingredients.
Once the second round is complete, stir the sweetened condensed milk into the pitcher until smooth.
Adjust sweetness to personal preference and serve over ice.