PREPARATION

Scrub limes clean with soap and a brush or the rough side of a sponge. Some limes have a waxy coating—make sure to remove it since the peel will be used.

Cut off the ends of all 4 limes, then roughly chop them, keeping the peel on.

Add half of the limes, half of the water, and half of the sugar to a blender or large food processor. Blend for about 10–15 seconds.

Strain the blended mixture through a mesh strainer into a pitcher. Discard the pulp.

Repeat the blending and straining process with the remaining ingredients.

Stir in the sweetened condensed milk until smooth.

Adjust the sweetness to taste and serve over ice.